ISO 2553:2013
(Main)Welding and allied processes — Symbolic representation on drawings — Welded joints
Welding and allied processes — Symbolic representation on drawings — Welded joints
ISO 2553:2013 defines the rules to be applied for symbolic representation of welded joints on technical drawings. This may include information about the geometry, manufacture, quality and testing of the welds. The principles of this standard may also be applied to soldered and brazed joints. It is recognized that there are two different approaches in the global market to designate the arrow side and other side on drawings. In ISO 2553:2013: sections, tables and figures which carry the suffix letter "A" are applicable only to the symbolic representation system based on a dual reference line; sections, tables and figures which carry the suffix letter "B" are applicable only to the symbolic representation system based on a single reference line; sections, tables and figures which do not have the suffix letter "A" or "B" are applicable to both systems. The symbols shown may be combined with other symbols used on technical drawings, for example to show surface finish requirements. An alternative designation method is presented which may be used to represent welded joints on drawings by specifying essential design information such as weld dimensions, quality level, etc. The joint preparation and welding process(es) are then determined by the production unit in order to meet the specified requirements.
Soudage et techniques connexes — Représentations symboliques sur les dessins — Joints soudés
L'ISO 2553:2013 définit les règles à suivre pour représenter symboliquement les joints soudés sur les dessins techniques. Cela peut inclure des informations sur la géométrie, la fabrication, la qualité et les essais des soudures. Les principes de la présente Norme internationale peuvent également être appliqués aux joints soudés et brasés. L'ISO 2553:2013 reconnaît qu'il existe deux méthodes différentes sur le marché mondial pour désigner le côté ligne repère et le côté opposé à la ligne repère sur les dessins. Il convient de noter que les articles, tableaux et figures qui portent le suffixe «A» sont applicables uniquement au système de représentation symbolique fondé sur un double trait de référence; les articles, tableaux et figures qui portent le suffixe «B» sont applicables uniquement au système de représentation symbolique fondé sur un trait de référence simple; les articles, tableaux et figures qui ne portent ni le suffixe «A» ni le suffixe «B» sont applicables aux deux systèmes. Les symboles donnés dans la présente Norme internationale peuvent être combinés à d'autres symboles utilisés sur les dessins techniques, par exemple pour indiquer les exigences de finition de surface. Une autre méthode de désignation est donnée. Elle peut être utilisée pour représenter des joints soudés sur les dessins en spécifiant les informations essentielles de conception, tels que les dimensions de la soudure, le niveau de qualité, etc. La préparation du joint et le(s) procédé(s) de soudage sont ensuite déterminés par l'unité de production afin de satisfaire aux exigences spécifiées.
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INTERNATIONAL ISO
STANDARD 2553
Fourth edition
2013-12-15
Welding and allied processes —
Symbolic representation on drawings
— Welded joints
Soudage et techniques connexes — Représentations symboliques sur
les dessins — Joints soudés
Reference number
ISO 2553:2013(E)
©
ISO 2013
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ISO 2553:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
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Published in Switzerland
ii © ISO 2013 – All rights reserved
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ISO 2553:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Welding symbol . 4
4.1 General . 4
4.2 Basic welding symbol . 4
4.3 Welding symbol systems . 5
4.4 Elementary symbols . 5
4.5 Supplementary symbols . 9
4.6 Arrow line .14
4.7 Reference line and weld location .16
4.8 Tail .19
5 Dimensioning of welds .19
5.1 General .19
5.2 Cross-sectional dimensions .19
5.3 Length dimensions .19
5.4 Butt welds .20
5.5 Fillet welds .21
5.6 Plug welds in circular holes .21
5.7 Plug welds in slots .21
5.8 Spot welds .22
5.9 Seam welds .22
5.10 Edge welds .22
5.11 Stud welds .22
5.12 Overlay welds .22
6 Dimensioning of joint preparations .34
6.1 General .34
6.2 Root gap .34
6.3 Included angle .34
6.4 Radii and root faces — U and J butt joints .35
6.5 Depth of joint preparation .35
6.6 Countersink angle for plug and slot welds .37
7 Alternative butt weld symbol with required weld quality .38
7.1 General .38
7.2 Example .38
Annex A (informative) Examples of the use of welding symbols .39
[9]
Annex B (informative) Tolerances and transition points for weld types .50
Annex C (informative) Alternative methods for designating intermittent butt and fillet welds .51
Bibliography .54
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ISO 2553:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC Welding and allied processes, Subcommittee SC 7,
Representation and terms.
This fourth edition cancels and replaces the third edition (ISO 2553:1992), which has been technically
revised.
Requests for official interpretations of any aspect of this standard should be directed to the Secretariat of
ISO/TC 44/SC 7 via your national standards body, a complete listing of which can be found at ww.iso.org.
iv © ISO 2013 – All rights reserved
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ISO 2553:2013(E)
Introduction
The symbols given in this standard can be used on technical drawings for welded components. Design-
related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler
material and testing specifications, can be indicated directly at the weld by means of the symbols given
in this standard. The principals of this standard can be applied to brazed and soldered joints.
Clarity may be improved by references to collective information in the drawings or references to
additional design-related documents.
Preparation for production may require detailed welding-related planning. The type of representation
described in this standard can be used for this purpose and complemented by additional production-
related information (e.g. welding position, welding process, WPS, weld preparation, preheating …).
This information is often given in production-related documents, such as work schedules or welding
procedure specifications (WPS).
Technical drawings are intended to clearly and understandably illustrate design-related specifications.
Welding-related drawings should be prepared and checked by specially trained personnel (see ISO 14731).
This edition of ISO 2553 recognizes that there are two different approaches in the global market to
designate the arrow side and other side on drawings, and allows for either to be used in isolation, to suit
a particular market need. Application of either approach identifies a welding symbol in accordance with
this International Standard. The approach in accordance with system A is based on ISO 2553:1992. The
approach in accordance with system B is based upon standards used by Pacific Rim countries.
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INTERNATIONAL STANDARD ISO 2553:2013(E)
Welding and allied processes — Symbolic representation
on drawings — Welded joints
1 Scope
This International Standard defines the rules to be applied for symbolic representation of welded joints
on technical drawings. This may include information about the geometry, manufacture, quality and
testing of the welds. The principles of this standard may also be applied to soldered and brazed joints.
It is recognized that there are two different approaches in the global market to designate the arrow side
and other side on drawings. In this Interational Standard:
— clauses, tables and figures which carry the suffix letter “A” are applicable only to the symbolic
representation system based on a dual reference line;
— clauses, tables and figures which carry the suffix letter “B” are applicable only to the symbolic
representation system based on a single reference line;
— clauses, tables and figures which do not have the suffix letter “A” or “B” are applicable to both systems.
The symbols shown in this International Standard may be combined with other symbols used on
technical drawings, for example to show surface finish requirements.
An alternative designation method is presented which may be used to represent welded joints on
drawings by specifying essential design information such as weld dimensions, quality level, etc. The
joint preparation and welding process(es) are then determined by the production unit in order to meet
the specified requirements.
NOTE Examples given in this International Standard, including dimensions, are illustrative only and are
intended to demonstrate the proper application of principles. They are not intended to represent good design
practices, or to replace code or specification requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 128 (all parts), Technical drawings — General principles of presentation
ISO 129-1, Technical drawings — Indication of dimensions and tolerances — Part 1: General principles
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 3098-2, Technical product documentation — Lettering — Part 2: Latin alphabet, numerals and marks
ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers
ISO/TR 25901:2007, Welding and related processes — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/TR 25901 and the following apply.
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ISO 2553:2013(E)
3.1
welding symbol
symbol consisting of an arrow line and a reference line and which may also include elementary and
supplementary symbols, dimensions and/or tail, used on technical drawings to indicate welded joint
type, location and joint preparation
Note 1 to entry: See Clause 4.
3.2
basic welding symbol
symbol consisting of an arrow line, reference line and tail used when the joint is not specified and only
to indicate that a welded joint is to be made
Note 1 to entry: See 4.2.
3.3
arrow line
leader line used to indicate the joint that is to be welded generally drawn at 135° to the reference line
Note 1 to entry: See 4.6.
3.4
reference line
part of the welding symbol on which the elementary symbol is located, generally drawn parallel to the
bottom edge of the drawing
Note 1 to entry: See 4.7.
3.5
tail
V shaped element added to the end of the continuous reference line away from the arrow line
Note 1 to entry: See 4.8.
3.6
arrow side
side of the joint to which the arrow line is pointing
Note 1 to entry: See 4.7.2.1.
3.7
other side
opposite side of the joint to the arrow side
Note 1 to entry: See 4.7.2.1.
3.8
elementary symbol
symbol forming part of the welding symbol and drawn on the reference line to indicate the type of weld
and joint preparation
Note 1 to entry: See 4.4.
3.9
supplementary symbol
symbol used in conjunction with elementary symbols to convey additional information about the joint
Note 1 to entry: See 4.5.
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ISO 2553:2013(E)
3.10
complementary information
non-symbolic information, relevant to the welds being made, which may be included in the tail of the
welding symbol
Note 1 to entry: See 4.8.
3.11
intermittent weld
series of weld elements made at intervals along a joint
[SOURCE: ISO/TR 25901:2007]
Note 1 to entry: See 5.3.2.
3.11.1
chain intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the
welds lie opposite one another along the joint
Note 1 to entry: See 5.3.2.2.
3.11.2
staggered intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the
welds on one side lie opposite to the spaces on the other side along the joint
Note 1 to entry: See 5.3.2.3.
3.12
offset
distance between the start of welding on one side of a staggered intermittent weld made on both sides
of the joint and the start of welding on the other side
Note 1 to entry: See 5.3.2.3, Table 3 and Table 5, No 2.6.
3.13
back run
final run deposited on the root side of a fusion weld
3.14
backing weld
backing in the form of a weld
3.15
nominal weld length
design length of a weld
3.15.1
nominal length of weld elements
in intermittent welds, the design length of the elements of the weld
3.16
nominal throat thickness
a
design value of the height of the largest isosceles triangle that can be inscribed in the section of a fillet weld
Note 1 to entry: Other design throat thicknesses may be used, but need to be specified.
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ISO 2553:2013(E)
3.17
leg length
z
distance from the actual or projected intersection of the fusion faces and the toe of a fillet weld, measured
across the fusion face
3.18
penetration depth
thickness of the weld metal excluding any reinforcement
3.19
deep penetration throat thickness
s
nominal or effective throat thickness to which a certain amount of fusion penetration is added
3.20
flare-bevel weld
butt weld between a joint member with a curved surface and another with a planar surface
Note 1 to entry: See Table 5.
3.21
flare-V weld
butt weld between two members with curved surfaces
Note 1 to entry: See Table 5.
3.22
field weld
weld made outside workshops usually at the place of final installation
4 Welding symbol
4.1 General
A reference line and arrow line are required elements. Additional elements may be included to convey
specific information.
It is preferable that the welding symbol is shown on the same side of the joint that the weld is to be made,
i.e. the arrow side (see 4.6).
The thickness of the arrow lines, reference line, elementary symbols and lettering shall be in accordance
with ISO 128 and ISO 3098-2.
In order not to overburden drawings, reference should be made to notes in the drawing or other design-
related documents.
4.2 Basic welding symbol
If joint details are not specified and the only requirement is to indicate that a joint is to be welded, the
basic symbol shown in Figure 1 may be used. In this case, a dual reference line is not required for system
A (see 4.6.1A) as no details concerning the weld are being conveyed.
The basic welding symbol shall comprise an arrow line, reference line and a tail.
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ISO 2553:2013(E)
Key
1 arrow line
2 reference line
3 tail
NOTE This symbol is often used to indicate the location of tack welds.
Figure 1 — Basic welding symbol (joint details and type not specified)
4.3 Welding symbol systems
This International standard recognizes two different systems, A and B, to designate the arrow side and
other side on drawings.
The symbolic representation in system A is based on a dual reference line consisting of a continuous line
and a dashed line (see 4.7).
The symbolic representation in system B is based on a single reference line (see 4.7).
Clauses, Tables and Figures which carry the suffix “A” or “B” are applicable only to system A or system
B respectively.
Clauses, tables and figures which do not have a suffix are applicable to both systems.
System A and B shall not be mixed and drawings shall clearly indicate which system is used including
units of measurement in accordance with ISO 129-1.
Examples of comprehensive welding symbols showing the location of elements are given in Figure A.1.
4.4 Elementary symbols
4.4.1 General
Elementary symbols, in accordance with Table 1, can be added to the reference line in both systems A
and B to indicate the type of weld to be made.
Elementary symbols form part of the welding symbol and shall be drawn attached to the reference line
generally at the mid-point.
Elementary symbols may be complemented by:
— supplementary symbols (see 4.5 and Table 3);
— dimensions (see Clause 5);
— complementary information.
The orientation of the elementary symbols shall not be changed to that shown.
Annex B gives guidance on tolerances and transition points for butt welds, edge welds and fillet welds.
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ISO 2553:2013(E)
If clear illustration by means of symbols is not possible, cross sections of the welds may be drawn
and dimensioned.
Table 1 — Elementary symbols
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
b
1 Square butt
b
2 Single-V butt
Single-V butt with
3
b
broad root face
b
4 Single-bevel butt
Single-bevel butt
5 with broad root
b
face
b
6 Single-U butt
b
7 Single-J butt
8 Flare V
9 Flare bevel
a
The grey line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwise indicated by dimensions on the welding symbol or by reference to
other information, for example the WPS.
c
May be used for joints with more than 2 members.
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ISO 2553:2013(E)
Table 1 (continued)
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
10 Fillet
Plug (in slots or
11
circular holes)
Resistance spot
(including projec-
12
tion welding in
system A)
Fusion spot (and
13 projection welding
in system B)
14 Resistance seam
15 Fusion seam
16 Stud
Steep-flanked
17
b
single-V butt
Steep-flanked
18
b
single-bevel butt
a
The grey line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwise indicated by dimensions on the welding symbol or by reference to
other information, for example the WPS.
c
May be used for joints with more than 2 members.
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ISO 2553:2013(E)
Table 1 (continued)
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
c
19 Edge
Flanged butt/cor-
20
ner weld
21 Overlay
c
22 Stake
a
The grey line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwise indicated by dimensions on the welding symbol or by reference to
other information, for example the WPS.
c
May be used for joints with more than 2 members.
4.4.2 Combinations of elementary symbols
Elementary symbols may be combined as required to represent particular weld configurations.
4.4.3 Double-sided butt welds
The elementary symbols shall be arranged opposite each other on the reference line, including all
required information, when used to represent symmetrical welds.
In the case of symmetrical double-sided welds with identical symbols and dimensions, the dashed
reference line should be deleted for system A (see Table 2).
An example of an asymmetrical double-sided weld is shown in Table A.3.
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ISO 2553:2013(E)
Table 2 — Combined elementary symbols to represent double-sided welds
a b
No. Weld type Illustration of weld Symbol
1 Double-V butt
2 Double bevel butt
3 Double-U butt
Double bevel butt (with
4 broad root face) and
fillet welds
a
Welds may be partial or full penetration which is to be indicated by dimensions on the welding symbol (see Table 5) or
by reference to other information, for example the WPS.
b
The grey line is not part of the symbol. It indicates the position of the reference line.
4.5 Supplementary symbols
4.5.1 General
Additional information concerning the required joint may be provided by the use of supplementary
symbols in accordance with Table 3. Supplementary symbols can, for example, provide information
about the shape of the weld or how the welded joint shall be made.
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ISO 2553:2013(E)
Table 3 — Supplementary symbols
a a
No. Designation Symbol Application example Illustration of weld
Flat-finished
1
b
flush
b
2 Convex
b
3 Concave
Toes blended
4 No example
c
smoothly
d
a) Back run
(made after the
single-V butt
weld)
5
d
b) Backing weld
(made before
the single-V butt
weld)
Specified root
6 reinforcement
e
(butt welds)
Backing (unspeci-
7a
fied)
Permanent back-
7b
f
ing
Removable/tem-
7c
f
porary backing
8 Spacer
a
The grey line is not part of the symbol and is included to show the position of symbol on reference line and/or the arrow
line only.
b
Welds that require approximately flush or convex faces without post weld finishing are specified by use of the flush or
convex contour symbol.
Welds to be finished flush or convex by post weld finishing or that require a flat but not flush surface require additional
information, e.g. addition of a note in the tail of the welding symbol
Other symbols in accordance with ISO 1302 may be used to specify surface finish.
c
The toes shall be blended smoothly by welding or finishing. Processing details may be specified in the work instructions
or WPS.
d
The weld run sequence may be indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by
reference to a weld procedure specification.
e
In system B, also used to designate flanged butt/corner welds (see 4.5.5.6)
f
M = material to be part of the final welded joint, MR = material to be removed after welding. Further information on the
material can be included in the tail or elsewhere.
g
Explanations of a, z, n, l and (e) are given in Clause 5.
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ISO 2553:2013(E)
Table 3 (continued)
a a
No. Designation Symbol Application example Illustration of weld
a) Joint showing insert in place
Consumable
9
insert
b) Welded joint showing root
bead (insert incorporated into
root). Single V but weld not
shown
Example A
10 Weld all-around
Example B
Example C
a
The grey line is not part of the symbol and is included to show the position of symbol on reference line and/or the arrow
line only.
b
Welds that require approximately flush or convex faces without post weld finishing are specified by use of the flush or
convex contour symbol.
Welds to be finished flush or convex by post weld finishing or that require a flat but not flush surface require additional
information, e.g. addition of a note in the tail of the welding symbol
Other symbols in accordance with ISO 1302 may be used to specify surface finish.
c
The toes shall be blended smoothly by welding or finishing. Processing details may be specified in the work instructions
or WPS.
d
The weld run sequence may be indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by
reference to a weld procedure specification.
e
In system B, also used to designate flanged butt/corner welds (see 4.5.5.6)
f
M = material to be part of the final welded joint, MR = material to be removed after weld
...
DRAFT INTERNATIONAL STANDARD ISO/DIS 2553
ISO/TC 44/SC 7 Secretariat: BSI
Voting begins on Voting terminates on
2011-04-07 2011-09-07
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Welding and allied processes — Symbolic representation
on drawings — Welded, brazed and soldered joints
Soudage et techniques connexes — Représentations symboliques sur les dessins — Joints soudés et brasés
[Revision of third edition (ISO 2553:1992)]
ICS 01.100.20; 25.160.40
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2011
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ISO/DIS 2553
Copyright notice
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under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
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ii © ISO 2011 – All rights reserved
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ISO/DIS 2553
Contents Page
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Welding symbol . 4
4.1 General . 4
4.2 Basic welding symbol . 4
4.3 Elementary symbols . 4
4.3.1 General . 4
4.3.2 Combinations of elementary symbols . 8
4.3.3 Symmetrical welds . 9
4.3.4 Asymmetrical welds . 9
4.4 Supplementary symbols . 10
4.4.1 General . 10
4.4.2 Peripheral welds . 12
4.4.3 Circumferential welds . 12
4.4.4 Welds of the same type made from point to point . 13
4.4.5 Site welds . 13
4.4.6 Root reinforcement – butt welds and edge welds . 13
4.5 Arrow line . 16
4.5.1 General . 16
4.5.2 Multiple arrow lines. 16
4.5.3 Broken arrow line . 17
4.6 Reference line and weld location . 17
4.6.1 Reference line . 17
4.6.2 Weld location . 17
4.6.3 Multiple reference lines . 19
4.7 Tail. 19
5 Dimensioning of welds . 20
5.1 General . 20
5.2 Cross sectional dimensions . 20
5.3 Length dimensions . 20
5.3.1 General . 20
5.3.2 Weld location . 20
5.3.3 Intermittent welds . 20
5.4 Butt welds . 21
5.4.1 Weld size . 21
5.4.2 Symmetrical butt welds . 21
5.4.3 Asymmetrical butt welds . 21
5.4.4 Edge welds on flanged butt and flanged corner joints . 21
5.4.5 Flare bevel and flare V butt welds . 21
5.5 Fillet welds. 22
5.5.1 Weld size . 22
5.5.2 Deep penetration fillet welds . 22
5.6 Plug welds . 22
5.7 Slot welds . 22
5.8 Spot welds . 23
5.9 Seam welds . 23
5.10 Edge welds . 23
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ISO/DIS 2553
5.11 Stud welds . 23
5.12 Surfacing welds . 23
6 Joint dimensions and geometry prior to welding . 41
6.1 General . 41
6.2 Root opening . 41
6.3 Included angle . 42
6.4 Radii and root faces - U and J butt joints . 43
6.5 Depth of joint preparation . 43
6.6 Countersink angle for plug and slot welds . 43
7 Method of symbolic representation of essential design information . 45
7.1 General . 45
7.2 Symbols and information to be provided . 48
7.3 Examples . 48
Annex A (informative) Examples of the use of welding symbols . 50
Annex B (informative) Tolerances and transitions points for weld types . 62
Annex C (informative) AWS A2.4 methods for designating intermittent welds . 63
Annex D (informative) Designation of welds of the same type made from point to point . 66
Bibliography . 67
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ISO/DIS 2553
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO 2553 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 7, Representation and terms.
This fourth edition cancels and replaces the third edition (ISO 2553:1992) which has been technically revised.
Requests for official interpretations of any aspect of this standard should be directed to the Secretariat of
ISO/TC 44/SC 7 via your national standards body, a complete listing of which can be found at ww.iso.org.
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ISO/DIS 2553
Introduction
The symbols included in this standard are intended to facilitate communication between the designer, the fabrication
shop and examination and inspection personnel. The symbols can be combined with other drawing symbols and
may also be supplemented by additional information. However, the symbols cannot always provide all the
information necessary in order to ensure that a fabrication is viable.
It is essential that throughout all stages of production, from product conception and design through to manufacture,
that there is adequate interaction between all personnel and departments concerned. The designer should be
familiar with the limitations of the joining and non-destructive testing processes and know how to specify adequate
welded, brazed or soldered joint sizes. The fabrication and inspection personnel may advise the designer on joining
processes and requirements for examination and testing. It may be that a designer wishes to place one or more
welded, brazed or soldered joints in a particular position that the production personnel, for one reason or another,
cannot produce. It may be that the positioning of the welded, brazed or soldered joints, as defined by the designer,
may be cost prohibitive and may have to be moved elsewhere by changing the design.
It is important that all these issues are resolved before production starts in order to avoid costly redesign and/or
rework.
As with all standards, training and familiarisation with the usage of the symbols in this document is paramount. It
has been assumed, in the drafting of this International Standard, its usage shall be entrusted to appropriately
qualified and experienced personnel.
Using an incorrect symbol can lead to confusion and delay whilst the drawing is checked. Similarly, personnel who
are not familiar with the symbols may need to spend time checking on their meaning. In both instances, any
incorrectly made welded, brazed or soldered joints may result in costly rework.
ISO 2553 recognizes that there are two somewhat different approaches in the global market to designate the arrow
side and other side on drawings, and allows for either to be used in isolation, to suit a particular market need.
Application of either approach identifies a welding symbol in accordance with this International Standard. The
approach in accordance with system A is based on ISO 2553:1992. The approach in accordance with system B is
based upon AWS A2.4.
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DRAFT INTERNATIONAL STANDARD ISO/DIS 2553
Welding and allied processes — Symbolic representation
on drawings — Welded, brazed and soldered joints
1 Scope
This International Standard defines the rules to be applied for symbolic representation of welded, brazed and
soldered joints in metallic materials on technical drawings. This can include information about the geometry,
manufacture, quality and testing of the welds.
This International standard is a combined specification that recognizes that there are two different approaches in the
global market to designate the arrow side and other side on drawings. It should be noted that:
Clauses, Tables and Figures which carry the suffix letter "A" are applicable only to the symbolic representation
system based on the dual reference line from ISO 2553:1992;
Clauses, Tables and Figures which carry the suffix letter "B" are applicable only to the symbolic representation
system based on the single reference line from AWS A2.4;
Clauses, Tables and Figures which do not have the suffix letter "A" or the suffix letter "B" are applicable to both
systems.
Systems A and B should not be mixed and drawings shall clearly indicate which system is used as well as units of
measurement in accordance with ISO 129-1 (see also 4.1).
The symbols shown in this International Standard can be combined with other symbols used on technical drawings
for example to show surface finish requirements.
Clause 7 describes an alternative designation method which can be used to represent welded joints on drawings by
specifying essential design information, e.g. weld dimensions, quality level etc. The joint preparation and welding
process(es) are then determined by the production unit in order to meet the specified requirements.
NOTE Examples given in this International Standard, including dimensions, are illustrative only and are intended to
demonstrate the proper application of principles. They are not intended to represent good design practices, or to replace code or
specification requirements.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 128, Technical drawings – General principles of presentation
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General principles
ISO 1302, Geometrical Product Specifications (GPS) – Indication of surface texture in technical product
documentation
ISO 3098-2, Technical product documentation – Lettering – Part 2: Latin alphabet, numerals and marks
ISO 4063, Welding and allied processes – Nomenclature of processes and reference numbers
ISO 17659, Welding — Multilingual terms for welded joints with illustrations
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ISO/DIS 2553
ISO/TR 25901:2007, Welding and related processes — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17659, ISO/TR 25901:2007 and the
following apply.
3.1
welding symbol
symbol consisting of an arrow line and a reference line and which may also include elementary and supplementary
symbols and/or tail, used on technical drawings to indicate welded brazed or soldered joint type, location and joint
preparation
NOTE 1 See Clause 4.
3.2
basic welding symbol
symbol consisting of an arrow line, reference line and tail used when the joint is not specified and only to indicate
that a welded, brazed or soldered joint is to be made
NOTE 1 See Figure 1.
NOTE 2 Often used to indicate the location of tack welds.
3.3
arrow line
element of the welding symbol that is used to indicate the joint that is to be welded, brazed or soldered, generally
drawn at 135° to the reference line
NOTE 1 See 4.5.
NOTE 2 The arrow line may be drawn at 45° to the reference line where space does not permit use of 135°.
3.4
reference line
element of the welding symbol on which the elementary symbol is located, generally drawn parallel to the bottom
edge of the drawing
NOTE See 4.6.
3.4.1
continuous line
solid element of the reference line
NOTE The continuous line is used in conjunction with a dashed line (system A) or alone (system B and system A
symmetrical welds).
3.4.2
dashed line
component of the reference line used to identify the other side of the joint to where the arrow line is pointing and
which can be drawn either above or below the continuous line
NOTE 1 The dashed line is ONLY used in accordance with system A and in conjunction with a continuous line.
NOTE 2 It is preferred that the dashed line be drawn below the continuous line.
3.5
tail
V shaped element added to the end of the continuous reference line away from the arrow line
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ISO/DIS 2553
NOTE See 4.7.
3.6
arrow side
the side of the joint to which the arrow line is pointing
NOTE See 4.6.2.1.
3.7
other side
the opposite side of the joint to which the arrow line is pointing
NOTE See 4.6.2.1.
3.8
elementary symbol
symbol forming part of the welding symbol and drawn on the reference line to indicate the type of weld and joint
preparation
NOTE See 4.3.
3.9
supplementary symbol
symbol used in conjunction with elementary symbols to convey more information about the joint
NOTE See 4.4.
3.10
complementary information
non symbolic information, relevant to the welds being made, which may be included in the tail of the welding symbol
NOTE See 4.7.
3.11
intermittent weld
series of welds made at intervals along a joint [ISO/TR 25901:2007]
NOTE See 5.3.3.
3.11.1
chain intermittent weld
intermittent weld on both sides of a joint in which the welds on one side are approximately opposite those on the
other side
NOTE See 5.3.3.2.
3.11.2
staggered intermittent weld
intermittent weld on both sides of a joint in which the welds on one side are alternated with respect to those on the
other side
NOTE See 5.3.3.3.
3.12
offset
the distance between the start of welding on one side of a staggered intermittent weld made on both sides of the
joint and the start of welding on the other side
NOTE 1 See 5.3.3.3, Table 3 and Table 6, No 2.6.
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ISO/DIS 2553
NOTE 2 If the centres of the welds on one side of the joint correspond with the centres of the gaps on the opposite side of the
joint, offset need not be specified.
4 Welding symbol
4.1 General
The reference line and arrow line are required elements. Additional elements may be included to convey specific
information.
It is preferable that the welding symbol is shown on the same side of the joint that the weld is to be made, i.e. the
arrow side (see 4.6).
The thickness of the arrow lines, reference line, weld symbols and lettering shall be in accordance with ISO 128 and
ISO 3098-2.
NOTE In order not to overburden drawings, additional information should be conveyed by other means for example; by
drawing notes or details; references to standards and welding procedure specifications (WPS's) or other drawings or instructions
that eliminate the need to include the corresponding elements in the symbol – see Figure 6b.
4.2 Basic welding symbol
If joint details are not specified and the only requirement is to indicate that a joint is to be welded, the basic symbol
shown in Figure 1 can be used. In this case, a dual reference line is not required for system A (see 4.6.1A) as no
details concerning the weld are being conveyed.
Key
1 Arrow line
2 Reference line
3 Tail
Figure 1 — Basic welding symbol (joint details and type not specified)
NOTE 1 A tail, without additional information, is added to the basic welding symbol to clarify that a weld is to be made.
NOTE 2 This symbol is often used to indicate the location of tack welds.
Examples of comprehensive welding symbols showing the location of elements are given in Figure A.1.
4.3 Elementary symbols
4.3.1 General
Elementary symbols, in accordance with Table 1, can be added to the reference line in both Systems A and B to
indicate the type of joint to be made.
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ISO/DIS 2553
Elementary symbols form part of the welding symbol and shall be drawn on the reference line (i.e. attached)
generally at the mid-point.
Elementary symbols can be complemented by:
supplementary symbols (see 4.4 and Table 3);
dimensions (see Clause 5);
complementary information.
Elementary symbols cannot be used alone to define the joining process to be used.
When the angle between the fusion faces is such that identification of the weld type and weld symbol are unclear,
reference should be made to ISO 17659 and ISO/TR 25901 (see also Annex B). Otherwise, information concerning
the desired joint and weld configuration shall be shown on the drawing or elsewhere.
NOTE In general, elementary symbols are similar in shape/geometry to the shape of the actual joint. They can also indicate
the type of joint prior to welding, for example V butt weld.
Table 1 — Elementary symbols
a
No. Weld Preparation Illustration of Weld
Symbol
and type (dashed lines show joint preparation prior to
welding)
b
1 Square butt
b
2 Single-V butt
Single-V butt
3 with broad root face
b
(see ISO 9692)
b
4 Single-bevel butt
Single-bevel butt
5
b
with broad root face
b
6 Single-U butt
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ISO/DIS 2553
Table 1 (continued)
a
No. Weld Preparation Illustration of Weld Symbol
and type (dashed lines show joint preparation prior to welding)
b
7 Single-J butt
8 Flare V
9 Flare Bevel
a) Back weld/
c
sealing run/UK
(made after the single-V
butt weld)
10
c
b) Backing weld
(made before the single-
V butt weld)
11 Fillet
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ISO/DIS 2553
Table 1 (continued)
a
No. Weld Preparation Illustration of Weld Symbol
and type (dashed lines show joint preparation prior to welding)
12 Plug or slot
Resistance Spot
13
(including projection)
14 Fusion spot
15 Resistance seam
16 Fusion seam
17 Stud
Steep-flanked
18
b
Single-V butt
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ISO/DIS 2553
Table 1 (continued)
a
No. Weld Preparation Illustration of Weld Symbol
and type (dashed lines show joint preparation prior to
welding)
Steep-flanked
19
b
single-bevel butt
d
20 Edge
21 Surfacing/overlay
Stake
22 (electron beam and laser
beam welding)
a
The gray line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds may be partial or full penetration which is to be indicated by dimensions on the weld symbol or by reference to other information, for
example the WPS.
c
The order of welding shall be clearly indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by reference to a weld
procedure specification. See also supplementary symbol, root reinforcement.
d
Can be used for joints with more than 2 members.
4.3.2 Combinations of elementary symbols
Elementary symbols can be combined as required to represent particular joint configurations. The elementary
symbols shall be placed in the order that the welded joint is produced with the first operation closest to the reference
line.
8 © ISO 2010 – All rights reserved
...
DRAFT INTERNATIONAL STANDARD ISO/DIS 2553.2
ISO/TC 44/SC 7 Secretariat: BSI
Voting begins on Voting terminates on
2012-08-30 2012-10-30
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Welding and allied processes — Symbolic representation
on drawings — Welded, brazed and soldered joints
Soudage et techniques connexes — Représentations symboliques sur les dessins — Joints soudés et brasés
[Revision of third edition (ISO 2553:1992)]
ICS 01.100.20; 25.160.40
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2012
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ISO/DIS 2553.2
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2012 – All rights reserved
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ISO/DIS 2553.2
Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Welding symbol.4
4.1 General .4
4.2 Basic welding symbol.4
4.3 Welding symbol systems .5
4.4 Elementary symbols.5
4.4.1 General .5
4.4.2 Combinations of elementary symbols .10
4.4.3 Double sided butt welds .10
4.5 Supplementary symbols.11
4.5.1 General .11
4.5.2 Weld all-around symbol.14
4.5.3 Welds of the same type made from point to point.14
4.5.4 Site welds .15
4.5.5 Root reinforcement – butt welds and edge welds .15
4.6 Arrow line .18
4.6.1 General .18
4.6.2 Multiple arrow lines.18
4.6.3 Broken arrow line .19
4.7 Reference line and weld location.19
4.7.1 Reference line .19
4.7.2 Weld location .19
4.7.3 Multiple reference lines.21
4.8 Tail.21
5 Dimensioning of welds .22
5.1 General .22
5.2 Cross sectional dimensions.22
5.3 Length dimensions.22
5.3.1 General .22
5.3.2 Intermittent welds.23
5.4 Butt welds .23
5.4.1 Penetration depth.23
5.4.2 Double sided welds.23
5.4.3 Flanged butt welds.24
5.4.4 Flare bevel and flare V butt welds .24
5.5 Fillet welds .24
5.5.1 Weld size .24
5.5.2 Deep penetration fillet welds.24
5.6 Plug welds in circular holes .24
5.7 Plug welds in slots .24
5.8 Spot welds.24
5.9 Seam welds.25
5.10 Edge welds.25
5.11 Stud welds.25
5.12 Overlay welds.25
6 Dimensioning of joint preparations.46
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ISO/DIS 2553.2
6.1 General. 46
6.2 Root opening. 46
6.3 Included angle. 47
6.4 Radii and root faces - U and J butt joints. 48
6.5 Depth of joint preparation. 48
6.6 Countersink angle for plug and slot welds . 50
7 Alternative butt weld symbol with required weld quality . 50
7.1 General. 50
7.2 Example. 50
Annex A (informative) Examples of the use of welding symbols. 52
Annex B (informative) Tolerances and transition points for weld types. 64
Annex C (informative) Alternative methods for designating intermittent butt and fillet welds. 65
C.1 General. 65
C.2 Butt welds. 65
C.2.1 Intermittent butt welds . 65
C.2.2 Chain intermittent butt welds . 65
C.2.3 Staggered Intermittent butt Welds. 65
C.3 Fillet welds. 65
C.3.1 Intermittent fillet welds. 65
C.3.2 Chain intermittent fillet welds. 65
C.3.3 Staggered Intermittent fillet Welds . 65
Annex D (normative) Designation of welds of the same type made from point to point. 68
Bibliography. 69
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ISO/DIS 2553.2
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO 2553 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 7, Representation and terms.
This fourth edition cancels and replaces the third edition (ISO 2553:1992), which has been substantially
technically revised.
Requests for official interpretations of any aspect of this standard should be directed to the Secretariat of
ISO/TC 44/SC 7 via your national standards body, a complete listing of which can be found at ww.iso.org.
© ISO 2012 – All rights reserved v
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ISO/DIS 2553.2
Introduction
Technical drawings are intended to clearly and understandably illustrate the design-related specifications.
The symbols given in this standard shall be used in technical drawings of welded, soldered or brazed
structural components. The design-related specifications, such as type, thickness, and length of weld, weld
quality, surface treatment, filler material and testing specifications, can be indicated directly at the weld by
means of the symbols given in this standard.
Clarity may be improved by references to collective information in the drawings or references to additional
design-related documents.
The preparation of the production may require detailed welding-related planning. The type of representation
described in this standard can be used for this purpose and complemented by additional production-related
aspects (e.g. welding position, welding process, WPS, weld preparation, preheating …).
This information is often given in production-related documents, such as work schedules or welding procedure
specifications (WPS).
Welding-related drawings should be prepared and checked by specially trained personnel (see ISO 14731).
ISO 2553 recognizes that there are two different approaches in the global market to designate the arrow side
and other side on drawings, and allows for either to be used in isolation, to suit a particular market need.
Application of either approach identifies a welding symbol in accordance with this International Standard. The
approach in accordance with system A is based on ISO 2553:1992. The approach in accordance with system
B is based upon standards used by Pacific Rim countries.
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DRAFT INTERNATIONAL STANDARD ISO/DIS 2553.2
Welding and allied processes — Symbolic representation on drawings — Welded, brazed
and soldered joints
1 Scope
This International Standard defines the rules to be applied for symbolic representation of welded, brazed and
soldered joints in metallic materials on technical drawings. This can include information about the geometry,
manufacture, quality and testing of the welds.
This International standard is a combined specification that recognizes that there are two different approaches
in the global market to designate the arrow side and other side on drawings. It should be noted that:
Clauses, Tables and Figures which carry the suffix letter "A" are applicable only to the symbolic
representation system based on a dual reference line;
Clauses, Tables and Figures which carry the suffix letter "B" are applicable only to the symbolic
representation system based on a single reference line;
Clauses, Tables and Figures which do not have the suffix letter "A" or the suffix letter "B" are applicable to
both systems.
The symbols shown in this International Standard can be combined with other symbols used on technical
drawings for example to show surface finish requirements.
An alternative designation method is shown which can be used to represent welded joints on drawings by
specifying essential design information such as weld dimensions, quality level etc. The joint preparation and
welding process(es) are then determined by the production unit in order to meet the specified requirements.
NOTE Examples given in this International Standard, including dimensions, are illustrative only and are intended to
demonstrate the proper application of principles. They are not intended to represent good design practices, or to replace
code or specification requirements.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 128 (all parts), Technical drawings – General principles of presentation
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General principles
ISO 1302, Geometrical Product Specifications (GPS) – Indication of surface texture in technical product
documentation
ISO 3098-2, Technical product documentation – Lettering – Part 2: Latin alphabet, numerals and marks
ISO 4063, Welding and allied processes – Nomenclature of processes and reference numbers
ISO/TR 25901:2007, Welding and related processes — Vocabulary
1 © ISO 2012 – All rights reserved
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ISO/DIS 2553.2
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/TR 25901:2007 and the following
apply.
3.1
welding symbol
symbol consisting of an arrow line and a reference line and which may also include elementary and
supplementary symbols, dimensions and/or tail, used on technical drawings to indicate welded brazed or
soldered joint type, location and joint preparation
NOTE 1 See Clause 4.
3.2
basic welding symbol
symbol consisting of an arrow line, reference line and tail used when the joint is not specified and only to
indicate that a welded, brazed or soldered joint is to be made
NOTE 1 See 4.2.
3.3
arrow line
leader line used to indicate the joint that is to be welded, brazed or soldered, generally drawn at 135° to the
reference line
NOTE 1 See 4.5.
3.4
reference line
part of the welding symbol on which the elementary symbol is located, generally drawn parallel to the bottom
edge of the drawing
NOTE 1 See 4.6.
NOTE 2 The reference line can be drawn parallel to the side edge of the drawing (whole welding symbol rotated by
90°) but should only be done when space does not permit drawing parallel to the bottom edge.
3.5
tail
V shaped element added to the end of the continuous reference line away from the arrow line
NOTE See 4.7.
3.6
arrow side
the side of the joint to which the arrow line is pointing
NOTE See 4.6.2.1.
3.7
other side
the opposite side with regards to the side to which the arrow is pointing
NOTE See 4.6.2.1.
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ISO/DIS 2553.2
3.8
elementary symbol
symbol forming part of the welding symbol and drawn on the reference line to indicate the type of weld and
joint preparation
NOTE See 4.3.
3.9
supplementary symbol
symbol used in conjunction with elementary symbols to convey more information about the joint
NOTE See 4.4.
3.10
complementary information
non symbolic information, relevant to the welds being made, which may be included in the tail of the welding
symbol
NOTE See 4.7.
3.11
intermittent weld
series of weld elements made at intervals along a joint [ISO/TR 25901:2007]
NOTE See 5.3.3.
3.11.1
chain intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the welds lie
opposite one another along the joint
NOTE See 5.3.3.2.
3.11.2
staggered intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the welds on
one side lie opposite to the spaces on the other side along the joint
NOTE See 5.3.3.3.
3.12
offset
the distance between the start of welding on one side of a staggered intermittent weld made on both sides of
the joint and the start of welding on the other side
NOTE 1 See 5.3.3.3, Table 3 and Table 5, No 2.6.
NOTE 2 If the centres of the welds on one side of the joint correspond with the centres of the gaps on the opposite side
of the joint, offset need not be specified.
3.13
backing run
final run deposited on the root side of a fusion weld
3.14
backing weld
backing in the form of a weld
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ISO/DIS 2553.2
3.15
nominal weld length
design length of a weld
3.15.1
nominal length of weld elements
in intermittent welds, the design length of the elements of the weld
3.16
nominal throat thickness, a
design value of the height of the largest isosceles triangle that can be inscribed in the section of a fillet weld
NOTE Other design throat thicknesses may be used, bur need to be specified.
3.17
leg length, z
distance from the actual or projected intersection of the fusion faces and the toe of a fillet weld, measured
across the fusion face
3.18
penetration depth
in butt welds, the thickness of the weld metal excluding any reinforcement
3.18.1
deep penetration throat thickness, s
nominal throat thickness to which a certain amount of fusion penetration is added
3.19
flare-bevel weld
a butt weld between a joint member with a curved surface and another with a planar surface
3.20
flare-V weld
a butt weld between two members with curved surfaces
4 Welding symbol
4.1 General
The reference line and arrow line are required elements. Additional elements may be included to convey
specific information. The arrow line can be joined to either end of the reference line.
It is preferable that the welding symbol is shown on the same side of the joint that the weld is to be made, i.e.
the arrow side (see 4.6).
The thickness of the arrow lines, reference line, elementary symbols and lettering shall be in accordance with
ISO 128 and ISO 3098-2.
NOTE In order not to overburden drawings, reference can be made to notes in the drawing or other design-related
documents.
4.2 Basic welding symbol
If joint details are not specified and the only requirement is to indicate that a joint is to be welded, the basic
symbol shown in Figure 1 can be used. In this case, a dual reference line is not required for system A (see
4.6.1A) as no details concerning the weld are being conveyed.
The basic welding symbol shall comprise an arrow line, reference line and a tail. However, when additional
information is added to the reference line, the tail becomes optional (see 4.7).
© ISO 2012 – All rights reserved 4
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ISO/DIS 2553.2
Key
1 Arrow line
2 Reference line
3 Tail
Figure 1 — Basic welding symbol (joint details and type not specified)
NOTE 2 This symbol is often used to indicate the location of tack welds.
Examples of comprehensive welding symbols showing the location of elements are given in Figure A.1.
4.3 Welding symbol systems
This International standard is a combined specification that recognizes two different systems, A and B, to
designate the arrow side and other side on drawings.
The symbolic representation in system A is based on a dual reference line consisting of a continuous line and
a dashed line (see 4.7).
The symbolic representation in system B is based on a single reference line (see 4.7).
Clauses, Tables and Figures which carry the suffix "A" or "B" are applicable only to system A or system B
respectively.
Clauses, Tables and Figures which do not have a suffix are applicable to both systems.
System A and B shall not be mixed and drawings shall clearly indicate which system is used including units of
measurement in accordance with ISO 129-1.
4.4 Elementary symbols
4.4.1 General
Elementary symbols, in accordance with Table 1, can be added to the reference line in both Systems A and B
to indicate the type of weld to be made.
NOTE Information regarding tolerances and transition points for weld types is given in Annex B.
Elementary symbols form part of the welding symbol and shall be drawn attached to the reference line
generally at the mid-point.
Elementary symbols can be complemented by:
supplementary symbols (see 4.4 and Table 3);
dimensions (see Clause 5);
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ISO/DIS 2553.2
complementary information.
The orientation of the elementary symbols shall not be changed to that shown.
Annex B gives guidance on tolerances and transition points for butt welds, edge welds and fillet welds.
If clear illustration by means of symbols is not possible, cross sections of the welds can be drawn and
dimensioned.
Table 1 — Elementary symbols
No. Designation Illustration a
Symbol
(dashed lines show joint preparation prior to
welding)
b
1
Square butt
b
2
Single-V butt
Single-V butt
3
b
with broad root face
b
4
Single-bevel butt
Single-bevel butt
5
b
with broad root face
b
6
Single-U butt
b
7
Single-J butt
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ISO/DIS 2553.2
Table 1 (continued)
No. Designation Illustration a
Symbol
(dashed lines show joint preparation prior to
welding)
8 Flare V
9 Flare Bevel
10 Fillet
Plug (in slots or circular
11
holes)
Resistance Spot
12
(including projection)
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ISO/DIS 2553.2
Table 1 (continued)
No. Designation Illustration a
Symbol
(dashed lines show joint preparation prior to
welding)
Fusion spot (and
13 projection welding in
system B where
14 Resistance seam
15 Fusion seam
16 Stud
Steep-flanked
17
b
Single-V butt
Steep-flanked
18
single-bevel butt b
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ISO/DIS 2553.2
Table 1 (continued)
No. Designation Illustration a
Symbol
(dashed lines show joint preparation prior to
welding)
c
19
Edge
Butt weld between
20 plates with raised
edges
22 Overlay
23 Stake
a
The gray line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwis
...
NORME ISO
INTERNATIONALE 2553
Quatrième édition
2013-12-15
Soudage et techniques connexes —
Représentations symboliques sur les
dessins — Joints soudés
Welding and allied processes — Symbolic representation on drawings
— Welded joints
Numéro de référence
ISO 2553:2013(F)
©
ISO 2013
---------------------- Page: 1 ----------------------
ISO 2553:2013(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2013
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur
l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à
l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
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E-mail copyright@iso.org
Web www.iso.org
Version française parue en 2013
Publié en Suisse
ii © ISO 2013 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 2553:2013(F)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 2
4 Symbole de soudage . 4
4.1 Généralités . 4
4.2 Symbole de soudage de base. 5
4.3 Systèmes de symboles de soudage . 5
4.4 Symboles élémentaires . 5
4.5 Symboles supplémentaires . 9
4.6 Ligne repère . .15
4.7 Trait de référence et position de la soudure.17
4.8 Fourche .20
5 Dimensions des soudures .21
5.1 Généralités .21
5.2 Cotes relatives à la section transversale .21
5.3 Cotes relatives aux dimensions longitudinales .21
5.4 Soudures bout à bout.22
5.5 Soudures d’angle .22
5.6 Soudures en bouchons en trous circulaires .23
5.7 Soudures en bouchons sur entailles .23
5.8 Soudures par points .23
5.9 Soudures à la molette .23
5.10 Soudures sur chant .23
5.11 Soudures de goujons .23
5.12 Soudures de rechargement .24
6 Cotation des assemblages avant soudage .36
6.1 Généralités .36
6.2 Écartement des bords à la racine .36
6.3 Angle d’ouverture .36
6.4 Rayons et méplats — Assemblages bout à bout en U et en demi U .37
6.5 Profondeur de préparation de l’assemblage .37
6.6 Angle de fraisure pour les soudures en bouchons et sur entailles .39
7 Autre symbole de soudure bout à bout avec niveau de qualité requis .40
7.1 Généralités .40
7.2 Exemples .40
Annexe A (informative) Exemples d’utilisation des symboles de soudage .41
[9]
Annexe B (informative) Tolérances et points de transition pour les types de soudure .53
Annexe C (informative) Autres méthodes de désignation des soudures bout à bout et
d’angle discontinues .54
Bibliographie .57
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ISO 2553:2013(F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (CEI) en ce qui concerne
la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/CEI, Partie 1. Il convient, en particulier de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/CEI, Partie 2 (voir www.
iso.org/directives).
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant les
références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de l’élaboration
du document sont indiqués dans l’Introduction et/ou sur la liste ISO des déclarations de brevets reçues
(voir www.iso.org/patents).
Les éventuelles appellations commerciales utilisées dans le présent document sont données pour
information à l’intention des utilisateurs et ne constituent pas une approbation ou une recommandation.
Pour une explication de la signification des termes et expressions spécifiques de l’ISO liés à l’évaluation
de la conformité, aussi bien que pour des informations au-sujet de l’adhésion de l’ISO aux principes
de l’OMC concernant les obstacles techniques au commerce (OTC) voir le lien suivant: Foreword -
Supplementary information
Le comité chargé de l’élaboration du présent document est l’ISO/TC 44, Soudage et techniques connexes,
sous-comité SC 7, Représentation et terminologie.
Cette quatrième édition annule et remplace la troisième édition (ISO 2553:1992), qui fait l’objet d’une
révision technique importante.
Il convient d’adresser les demandes d’interprétation officielle de tout aspect de la présente norme au
secrétariat de l’ISO/TC 44/SC 7, par l’intermédiaire de votre organisme national de normalisation; une
liste complète des organismes nationaux de normalisation peut être obtenue à l’adresse www.iso.org.
iv © ISO 2013 – Tous droits réservés
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ISO 2553:2013(F)
Introduction
Les symboles donnés dans la présente norme peuvent être utilisés sur les dessins techniques pour les
composants soudés. Les spécifications relatives à la conception, tels que le type, et la longueur de la
soudure, la qualité de la soudure, le traitement de surface, le matériau d’apport et les essais peuvent
être indiqués directement sur la soudure au moyen des symboles donnés dans la présente norme. Les
principes de la présente Norme internationale peuvent être appliqués aux joints soudés et brasés.
La clarté peut aussi être améliorée par des références à de l’information collective sur les dessins ou par
des références complémentaires à des documents relatifs à la conception.
La préparation de la fabrication peut demander un planning détaillé relatif au soudage. Le type de
représentation décrit dans la présente norme peut être utilisé dans ce but et complétée par des
informations liées à la fabrication (par exemple la position de soudage, procédé de soudage, DMOS,
préparation de la soudure, préchauffage, etc.)
Cette information est souvent donnée dans les documents liés à la fabrication, tels que les programmes
de travail ou les descriptifs de mode opératoire de soudage (DMOS).
Les dessins techniques sont destinés à illustrer de manière claire et compréhensible les spécifications
relatives à la conception. Il est recommandé que les dessins relatifs au soudage soient préparés et vérifiés
par du personnel spécifiquement formé (voir l’ISO 14731).
La présente édition de l’ISO 2553 reconnaît qu’il existe deux méthodes relativement différentes sur le
marché mondial pour désigner le côté ligne repère et le côté opposé à la ligne repère sur les dessins et
permet d’utiliser l’une ou l’autre isolément pour s’adapter aux besoins d’un marché donné. L’application
de l’une ou l’autre méthode identifie un symbole de soudage conformément à la présente Norme
internationale. La méthode conforme au système A est fondée sur l’ISO 2553:1992. La méthode conforme
au système B est fondée sur les normes utilisées par les pays de la zone Pacifique.
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NORME INTERNATIONALE ISO 2553:2013(F)
Soudage et techniques connexes — Représentations
symboliques sur les dessins — Joints soudés
1 Domaine d’application
La présente Norme internationale définit les règles à suivre pour représenter symboliquement les joints
soudés sur les dessins techniques. Cela peut inclure des informations sur la géométrie, la fabrication, la
qualité et les essais des soudures. Les principes de la présente Norme internationale peuvent également
être appliqués aux joints soudés et brasés.
La présente Norme internationale reconnaît qu’il existe deux méthodes différentes sur le marché
mondial pour désigner le côté ligne repère et le côté opposé à la ligne repère sur les dessins. Il convient
de noter que:
— les articles, tableaux et figures qui portent le suffixe «A» sont applicables uniquement au système de
représentation symbolique fondé sur un double trait de référence;
— les articles, tableaux et figures qui portent le suffixe «B» sont applicables uniquement au système de
représentation symbolique fondé sur un trait de référence simple;
— les articles, tableaux et figures qui ne portent ni le suffixe «A» ni le suffixe «B» sont applicables aux
deux systèmes.
Les symboles donnés dans la présente Norme internationale peuvent être combinés à d’autres symboles
utilisés sur les dessins techniques, par exemple pour indiquer les exigences de finition de surface.
Une autre méthode de désignation est donnée. Elle peut être utilisée pour représenter des joints soudés
sur les dessins en spécifiant les informations essentielles de conception, tels que les dimensions de la
soudure, le niveau de qualité, etc. La préparation du joint et le(s) procédé(s) de soudage sont ensuite
déterminés par l’unité de production afin de satisfaire aux exigences spécifiées.
NOTE Les exemples de la présente Norme internationale, y compris les dimensions, ne sont donnés qu’à
titre d’illustration et sont destinés à montrer l’application appropriée des principes. Ils n’ont pas pour but de
représenter les bonnes pratiques de conception ni de remplacer les exigences d’un code ou d’une spécification.
2 Références normatives
Les documents suivants, en totalité ou en partie, sont référencés de manière normative dans le présent
document et sont indispensables pour son application. Pour les références datées, seule l’édition citée
s’applique. Pour les références non datées, la dernière édition du document de référence s’applique (y
compris les éventuels amendements).
ISO 128 (toutes les parties), Dessins techniques — Principes généraux de représentation
ISO 129-1, Dessins techniques — Indication des cotes et tolérances — Partie 1: Principes généraux
ISO 1302, Spécification géométrique des produits (GPS) — Indication des états de surface dans la
documentation technique de produits
ISO 3098-2, Documentation technique de produits — Écriture — Partie 2: Alphabet latin, chiffres et signes
ISO 4063, Soudage et techniques connexes — Nomenclature et numérotation des procédés
ISO/TR 25901, Soudage et techniques connexes — Vocabulaire
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ISO 2553:2013(F)
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions donnés dans l’ISO/TR 25901 ainsi que
les suivants s’appliquent.
3.1
symbole de soudage
symbole constitué d’une ligne repère et d’un trait de référence qui peut également inclure des symboles
élémentaires et supplémentaires, des dimensions et/ou une fourche, utilisé sur les dessins techniques
pour indiquer le type, la position et la préparation d’un joint soudé
Note 1 à l’article: Voir Article 4.
3.2
symbole de soudage de base
symbole constitué d’une ligne repère, d’un trait de référence et d’une fourche, utilisé lorsque l’assemblage
n’est pas spécifié et uniquement pour indiquer qu’un joint soudé doit être réalisé
Note 1 à l’article: Voir 4.2.
3.3
ligne repère
ligne qui est utilisée pour indiquer l’assemblage qui doit être soudé, généralement tracé à 135° par
rapport au trait de référence
Note 1 à l’article: Voir 4.6.
3.4
trait de référence
partie du symbole de soudage sur lequel le symbole élémentaire est placé, généralement tracé
parallèlement au bord inférieur du dessin
Note 1 à l’article: Voir 4.7.
3.5
fourche
élément en forme de V ajouté à l’extrémité du trait de référence continu à distance de la ligne repère
Note 1 à l’article: Voir 4.8.
3.6
côté ligne repère
côté de l’assemblage vers lequel pointe la ligne repère
Note 1 à l’article: Voir 4.7.2.1.
3.7
côté opposé à ligne repère
côté opposé du joint soudé de la flèche
Note 1 à l’article: Voir 4.7.2.1.
3.8
symbole élémentaire
symbole faisant partie du symbole de soudage et tracé sur le trait de référence pour indiquer le type de
soudure et de préparation de l’assemblage
Note 1 à l’article: Voir 4.4.
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ISO 2553:2013(F)
3.9
symbole supplémentaire
symbole utilisé conjointement à des symboles élémentaires pour transmettre des informations
supplémentaires sur l’assemblage
Note 1 à l’article: Voir 4.5.
3.10
informations complémentaires
informations non symboliques, pertinentes pour les soudures réalisées, qui peuvent être incluses dans
la fourche du symbole de soudage
Note 1 à l’article: Voir 4.8.
3.11
soudure discontinue
série d’éléments de soudures exécutées de façon intermittente le long d’un assemblage
[SOURCE: ISO/TR 25901:2007]
Note 1 à l’article: Voir 5.3.2.
3.11.1
soudure discontinue symétrique
soudure discontinue de chaque côté de l’assemblage (couramment des soudures d’angle en T et d’assemblage
à recouvrement) de sorte que les soudures sont opposées les unes aux autres le long de l’assemblage
Note 1 à l’article: Voir 5.3.2.2.
3.11.2
soudure discontinue alternée
soudure discontinue de chaque côté de l’assemblage (couramment des soudures d’angle en T et
d’assemblage à recouvrement) de sorte que les soudures d’un côté sont opposées aux espaces de l’autre
côté de l’assemblage
Note 1 à l’article: Voir 5.3.2.3.
3.12
décalage
distance entre le début du soudage d’un côté d’une soudure discontinue alternée réalisée des deux côtés
de l’assemblage et le début du soudage de l’autre côté
Note 1 à l’article: Voir 5.3.2.3, Tableau 3 et Tableau 5, n°2.6.
3.13
passe envers
passe finale déposée sur le côté de passe de fond de la soudure par fusion
3.14
soudure envers
support-envers de la soudure
3.15
longueur nominale de la soudure
longueur de conception de la soudure
3.15.1
longueur nominale des éléments de soudure
pour les soudures discontinues, longueur de conception des éléments de la soudure
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ISO 2553:2013(F)
3.16
épaisseur de gorge nominale
α
valeur de conception de la hauteur du plus large triangle isocèle qui peut être inscrit dans la section de
la soudure d’angle
Note 1 à l’article: D’autres épaisseurs de conception de gorge peuvent être utilisées mais ont besoin d’être spécifiées.
3.17
côté
z
distance entre l’intersection réelle ou projetée des faces à souder et le raccordement d’une soudure
d’angle, mesurée à travers la surface de la soudure
3.18
profondeur de pénétration
pour les soudures bout à bout, épaisseur du métal déposé à l’exclusion de toute surépaisseur
3.19
épaisseur de gorge à pénétration profonde
s
dans une soudure d’angle, épaisseur de gorge nominale ou effective à laquelle est ajoutée une certaine
quantité de métal fondu
3.20
soudure évasée à chanfrein
soudure bout à bout entre une partie de l’assemblage présentant une surface arrondie et une autre
présentant une surface plane
Note 1 à l’article: Voir Tableau 5.
3.21
soudure évasée en V
soudure bout à bout entre deux parties présentant des surfaces arrondies
Note 1 à l’article: Voir Tableau 5.
3.22
soudure faite sur chantier
soudure réalisée en dehors de l’atelier en général sur le lieu final d’installation
4 Symbole de soudage
4.1 Généralités
Un trait de référence et une ligne repère sont des éléments exigés. Des éléments supplémentaires peuvent
être inclus pour transmettre des informations spécifiques.
Il est préférable que le symbole de soudage figure du côté de l’assemblage où doit être réalisée la soudure,
c’est-à-dire le côté ligne repère (voir 4.6).
L’épaisseur des lignes de repère, du trait de référence, des symboles élémentaires et de l’écriture doit
être conforme à l’ISO 128 et à l’ISO 3098-2.
Pour ne pas surcharger les dessins, il convient de faire référence à des notes sur le dessin ou d’autres
documents liés à la conception.
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ISO 2553:2013(F)
4.2 Symbole de soudage de base
Si les détails de l’assemblage ne sont pas spécifiés et que la seule exigence est d’indiquer qu’un
assemblage doit être soudé, le symbole de base représenté à la Figure 1 peut être utilisé. Dans ce cas,
un double trait de référence n’est pas requis pour le système A (voir 4.6.1A) car aucun détail concernant
la soudure n’est communiqué.
Le symbole de soudage de base doit comprendre une ligne repère, un trait de référence et une fourche.
Légende
1 ligne repère
2 trait de référence
3 fourche
NOTE Ce symbole est souvent utilisé pour indiquer la position des soudures de pointage.
Figure 1 — Symbole de soudage de base (type et détails de l’assemblage non spécifiés)
4.3 Systèmes de symboles de soudage
La présente Norme internationale reconnait deux différents systèmes, A et B, pour désigner le côté ligne
repère et le côté opposé à ligne repère sur les dessins.
La représentation symbolique du système A est fondé sur un double trait de référence consistant en une
ligne continue et une ligne interrompue (voir 4.7).
La représentation symbolique du système B est fondée sur un seul trait de référence (voir 4.7).
Les Articles, Tableaux et Figures qui portent le suffixe «A» ou «B» ne s’appliquent respectivement qu’au
système A ou au système B.
Les articles, tableaux et figures qui ne portent pas de suffixe s’appliquent aux deux systèmes.
Les systèmes A ou B ne doivent pas être mélangés et les dessins clairement indiquer quel système est
utilisé y compris les unités de mesure conforme à l’ISO 129-1.
Des exemples de symboles de soudage complets indiquant la position des éléments sont donnés à la
Figure A.1.
4.4 Symboles élémentaires
4.4.1 Généralités
Les symboles élémentaires, conformément au Tableau 1, peuvent être ajoutés au trait de référence dans
les systèmes A et B pour indiquer le type d’assemblage à réaliser.
Les symboles élémentaires font partie du symbole de soudage et doivent être tracés sur le trait de
référence, généralement en son milieu.
© ISO 2013 – Tous droits réservés 5
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ISO 2553:2013(F)
Les symboles élémentaires peuvent être complétés par:
— des symboles supplémentaires (voir 4.5 et Tableau 3);
— des dimensions (voir Article 5);
— des informations complémentaires.
L’orientation des symboles élémentaires ne doit pas être différente de celle indiquée.
L’Annexe B donne des lignes directrices sur les tolérances et les points de transition pour les soudures
bout à bout, les soudures sur chant et les soudures d’angle.
Si une représentation claire par des symboles n’est pas réalisable, il est possible de représenter et
dimensionner les sections droites des soudures.
Tableau 1 — Symboles élémentaires
a
N° Désignation Illustration Symbole
(les traits interrompus indiquent la
préparation de l’assemblage avant le
soudage)
Soudure bout à bout à bords
1
b
droits
b
2 Soudure bout à bout en V
b
3 Soudure bout à bout en Y
b
4 Soudure bout à bout en demi V
b
5 Soudure bout à bout en demi Y
b
6 Soudure bout à bout en U
b
7 Soudure bout à bout en J
8 Soudure évasée en V
a
Le trait gris ne fait pas partie du symbole. Il indique la position du trait de référence.
b
Les soudures sont à pleine pénétration sauf spécification contraire indiquée par les cotes sur le symbole de la soudure
ou par référence à d’autres informations, par exemple le DMOS.
c
Peut-être utilisé pour les assemblages de plus de deux parties.
6 © ISO 2013 – Tous droits réservés
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ISO 2553:2013(F)
Tableau 1 (suite)
a
N° Désignation Illustration Symbole
(les traits interrompus indiquent la
préparation de l’assemblage avant le
soudage)
9 Soudure évasée à chanfrein
10 Soudure d’angle
Soudure en bouchons ou sur
11
entailles
Soudure par points par résis-
12 tance (y compris le bossage
pour le système A)
Soudure par points par fusion
13 (et soudure par bossage pour le
système B)
Soudure à la molette par résis-
14
tance
15 Soudure à la molette fusion
a
Le trait gris ne fait pas partie du symbole. Il indique la position du trait de référence.
b
Les soudures sont à pleine pénétration sauf spécification contraire indiquée par les cotes sur le symbole de la soudure
ou par référence à d’autres informations, par exemple le DMOS.
c
Peut-être utilisé pour les assemblages de plus de deux parties.
© ISO 2013 – Tous droits réservés 7
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ISO 2553:2013(F)
Tableau 1 (suite)
a
N° Désignation Illustration Symbole
(les traits interrompus indiquent la
préparation de l’assemblage avant le
soudage)
16 Soudure des goujons
Soudure bout à bout en V à
17
b
flancs droits
b
Soudure bout à bout en demi V
18
à flancs droits
c
19 Soudure sur chant
Soudure bout à bout à bords
20 relevés/soudure en angle exté-
rieure
c
21 Soudure par rechargement
22 Soudure par transparence
a
Le trait gris ne fait pas partie du symbole. Il indique la position du trait de référence.
b
Les soudures sont à pleine pénétration sauf spécification contraire indiquée par les cotes sur le symbole de la soudure
ou par référence à d’autres informations, par exemple le DMOS.
c
Peut-être utilisé pour les assemblages de plus de deux parties.
8 © ISO 2013 – Tous droits réservés
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ISO 2553:2013(F)
4.4.2 Combinaisons de symboles élémentaires
Si nécessaire, des symboles élémentaires peuvent être combinés pour représenter des configurations
particulières de soudures.
4.4.3 Soudures bout à bout des deux côtés
Les symboles élémentaires doivent être disposés l’un en face de l’autre sur le trait de référence, et comprendre
toutes les informations requises, lorsqu’ils sont utilisés pour représenter des soudures symétriques.
Dans le cas de soudures bout à bout des deux côtés avec des symboles et dimensions identiques, il
convient de supprimer les traits de référence interrompus pour le système A (voir Tableau 2).
Un exemple de soudure asymétrique des deux côtés est indiqué dans le Tableau A.3.
Tableau 2 — Symboles élémentaires combinés pour représenter des soudures bout à bout
symétriques
a b
N° Type de soudure Illustration de la soudure Symbole
Soudure bout à bout en
1
double V
Soudure bout à bout
2
en K
Soudure bout à bout en
3
double U
Soudure bout à bout
en K (avec méplat) et
4
soudure d’angle avec
surépaisseur
a
Les soudures bout à bout peuvent être à pénétration partielle ou à pleine; ce qui doit être indiqué par des dimensions sur
le symbole élémentaire (voir Tableau 5) ou par référence à d’autres informations, par exemple le DMOS.
b
Le trait gris ne fait pas partie du symbole. Il indique la position du trait de référence.
4.5 Symboles supplémentaires
4.5.1 Généralités
Des informations supplémentaires concernant l’assemblage requis peuvent être données en utilisant des
symboles supplémentaires conformément au Tableau 3. Les symboles supplémentaires peuvent, par exemple,
fournir des informations sur la forme de la soudure ou la manière dont le joint soudé doit
...
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