oSIST prEN ISO 17660:2021
(Main)Welding - Welding of reinforcing steel (ISO/DIS 17660:2021)
Welding - Welding of reinforcing steel (ISO/DIS 17660:2021)
This standard applies to the welding of weldable reinforcing steels and stainless reinforcing steels according to relevant standards or technical qualifications in workshops or on site. It covers also joints between reinforcing steel bars and other steel components such as connection devices, insert anchors including prefabrica-ted assemblies.
This standard does not apply to factory production for welding fabric and lattice girders.
The requirements of this standard only apply for static loaded structures. This standard specifies requirements for materials, design and execution of welded joints, welding personnel, quality requirements, examination and testing.
Schweißen - Schweißen von Betonstahl (ISO/DIS 17660:2021)
Diese Norm gilt für das Schweißen von schweißgeeigneten Betonstählen und nichtrostenden Betonstählen nach den maßgebenden Normen oder technischen Zulassungen in Betrieben und auf der Baustelle. Sie enthält auch Verbindungen zwischen Betonstabstählen und anderen Stahlteilen wie Verbindungsvorrichtungen, Verankerungen einschließlich vorgefertigter Einbauteile.
Diese Norm gilt nicht für die fabrikmäßige Herstellung von Betonmatten und Gitterträgern.
Die Anforderung dieser Norm gilt nur für vorwiegend ruhend beanspruchte Bauteile. Diese Norm legt Anforderungen für Werkstoffe, Entwurf und Ausführung geschweißter Verbindungen, Schweißpersonal, Qualitätsanforderungen, Untersuchung und Prüfung fest.
Soudage - Soudage des aciers d'armatures (ISO/DIS 17660:2021)
La présente norme s'applique au soudage des aciers soudables et des aciers inoxydables pour armatures selon les normes applicables ou les qualifications techniques dans les ateliers ou sur chantier. Elle couvre également les assemblages entre les barres en acier pour armatures et d'autres éléments en acier tels que les raccords, les ancrages encastrés comportant des assemblages préfabriqués.
La présente norme ne s'applique pas à la production en usine pour souder les armatures en treillis soudés et les poutres en treillis.
Les exigences de la présente norme ne s'appliquent qu'aux structures soumises à des charges statiques. La présente norme spécifie des exigences relatives aux matériaux, à la conception et à l'exécution des assemblages soudés, au personnel de soudage, à la qualité, aux examens et aux essais.
Varjenje - Varjenje betonskega armaturnega jekla (ISO/DIS 17660:2021)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2021
Varjenje - Varjenje betonskega jekla (ISO/DIS 17660:2021)
Welding - Welding of reinforcing steel (ISO/DIS 17660:2021)
Schweißen - Schweißen von Betonstahl (ISO/DIS 17660:2021)
Soudage - Soudage des aciers d'armatures (ISO/DIS 17660:2021)
Ta slovenski standard je istoveten z: prEN ISO 17660
ICS:
25.160.01 Varjenje, trdo in mehko Welding, brazing and
spajkanje na splošno soldering in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT INTERNATIONAL STANDARD
ISO/DIS 17660
ISO/TC 44/SC 10 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-08-23 2021-11-15
Welding ― Welding of reinforcing steel
ICS: 25.160.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
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
ISO/CEN PARALLEL PROCESSING
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
Reference number
NATIONAL REGULATIONS.
ISO/DIS 17660:2021(E)
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. ISO 2021
ISO/DIS 17660:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
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Published in Switzerland
ii © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
5 Welding processes . 4
6 Preparations and specifications for welded joints . 4
6.1 General . 4
6.2 Butt joints . 5
6.2.1 Butt joints welded by welding process 111, 114, 135, 136, 138 or 141 . 5
6.2.2 Butt joints welded by welding process 24, 25 or 42 . 6
6.2.3 Butt joints welded by welding process 47 . 6
6.3 Lap joints . 6
6.4 Strap joints. 7
6.5 Cross joints . 8
6.5.1 General. 8
6.5.2 Cross joints for welding process 111, 114, 135, 136, 138 or 141 . 8
6.5.3 Cross joints for welding process 21 or 23 . 9
6.6 Joints between reinforcing steel bars and other steel components . 9
6.6.1 General. 9
6.6.2 Types of joint . 9
7 Materials .13
7.1 Parent materials .13
7.1.1 Reinforcing steels .13
7.1.2 Inspection documents .13
7.2 Welding consumables .14
8 Quality requirements .14
9 Welding personnel.14
9.1 Welding coordination .14
9.2 Welder and operator qualifications .14
9.2.1 Welders for load-bearing welded joints .14
9.2.2 Welding operators and resistance weld setters for load-bearing welded joints .16
9.2.3 Welders for non-load-bearing welded joints.16
9.3 Validity of qualification test certificate of welder and welding operator .16
10 Welding procedure specification (WPS) .16
11 Welding procedure qualification for load-bearing joints .16
11.1 General .16
11.2 Test specimens .16
11.3 Mechanical testing .16
11.4 Acceptance criteria .17
11.5 Range of qualification .17
11.5.1 Material .17
11.5.2 Diameter of reinforcing steel bar and material thickness .18
11.5.3 Other essential variables .19
11.6 Validity of welding procedure test .20
12 Production weld test .20
13 Execution and inspection of production welding of reinforcing steel .20
13.1 General .20
13.2 Welding of bent reinforcing steel bars.21
ISO/DIS 17660:2021(E)
13.3 Welds made by welding process 47 .22
14 Mechanical testing of specimens .22
14.1 General .22
14.2 Tensile test .22
14.2.1 Test specimen .22
14.2.2 Test procedure .22
14.2.3 Evaluation of test results .22
14.2.4 Report of test results .23
14.3 Shear test .23
14.3.1 Test specimen .23
14.3.2 Test procedure .23
14.3.3 Evaluation of test results .24
14.3.4 Report of test results .24
14.4 Bend test .24
14.4.1 Test specimen .24
14.4.2 Test procedure .24
14.4.3 Evaluation of test results .24
Annex A (informative) Welding procedure specification (WPS) .25
Annex B (informative) Test specimens .29
Annex C (informative) Evaluation of testing of welded joints .34
Annex D (informative) Example for production log .36
Annex E (normative) Classification of shear strength of load-bearing cross joints .38
Annex F (informative) Examples of diameter combinations for welding cross joints using
welding processes 21 and 23 .39
Bibliography .40
iv © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(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 (see 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 (see 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee [or Project Committee] ISO/TC [or ISO/PC] 44,
Welding and allied processes, Subcommittee SC 10, Quality management in the field of welding.
This second edition cancels and replaces the first edition (ISO 17660-1:2006 and ISO 17660-2:2006),
which has been technically revised.
The main changes compared to the previous edition are as follows:
— document editorially revised;
— part 1 and part 2 merged in one document;
— Figure 3, Figure 9, Figure 10 and Figure 11 technically revised;
— number of test pieces in subclause 9.2 regarding Welder and operator qualifications changed.
— document editorially revised;
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
DRAFT INTERNATIONAL STANDARD ISO/DIS 17660:2021(E)
Welding ― Welding of reinforcing steel
1 Scope
This document is applicable to the welding of weldable reinforcing steel and stainless reinforcing steel
of load-bearing joints or non-load-bearing joints, in workshops or on site. It specifies requirements for
materials, design and execution of welded joints, welding personnel, quality requirements, mechanical
testing. All provisions except subclause 9.2.3 apply to load-bearing joints. The requirements for non-
load-bearing joints are specified or illustrated in the subclause 6.1, 6.3, 6.5, Clause 8, subclause 9.2.3
and 13.
This document also covers welded joints between reinforcing steel bars and other steel components,
such as connection devices and insertion anchors, including prefabricated assemblies.
This document is not applicable to factory production of welding fabric and lattice girders using
multiple spot-welding machines or multiple projection welding machines.
The requirements of this document are only applicable to static loaded structures. For fatigue-loaded
structures, depending on type of joint and welding process, it is recommended that an appropriate
reduction be taken into account on the fatigue strength of the reinforcing steel.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 3834-3, Quality requirements for fusion welding of metallic materials — Part 3: Standard quality
requirements
ISO 3834-4, Quality requirements for fusion welding of metallic materials — Part 4: Elementary quality
requirements
ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers
ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections
ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels
ISO 14731, Welding coordination — Tasks and responsibilities
ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for mechanized
and automatic welding of metallic materials
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding
ISO 15609-2, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 2: Gas welding
ISO 15609-5, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 5: Resistance welding
ISO 15620, Welding — Friction welding of metallic materials
ISO/DIS 17660:2021(E)
ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing
bars, rods and wire
ISO 15630-2, Steel for the reinforcement and prestressing of concrete — Test methods — Part 2: Welded
fabric and lattice girders
ISO 16020, Steel for the reinforcement and prestressing of concrete — Vocabulary
ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints
3 Terms and definitions
For the purposes of this document, the terms and definitions given in the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
Load-bearing welded joints
welded joint used for transmission of specified loads between reinforcing steel bars or between
reinforcing steel bars and other steel products
3.2
Non-load-bearing welded joints
welded joint whose strength is not taken into account in the design of the reinforced concrete structure
Note 1 to entry: The purpose of a non-load-bearing welded joint is usually only to keep the reinforcing components
in their correct places during fabrication, transport and concreting. The weld is often called tack weld.
3.3
Shear factor
S
f
relation between the shear force of a cross joint and the nominal yield strength R , multiplied by the
e
nominal cross section area A , of the loaded bar
s
3.4
manufacturer
enterprise carrying out the welding works within workshops or on site
4 Symbols and abbreviated terms
a throat thickness
A percentage total elongation at maximum force
gt
A nominal cross-sectional area of the bar
n
A nominal cross-sectional area of the bar to be anchored
s
b excess of the bar
d, d , d nominal diameter of the welded bar
1 2
d maximum nominal diameter of the welded bar
max
d minimum nominal diameter of the welded bar
min
2 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
e distance between the bars
F force to be anchored by transverse bar
F maximum tensile force
max
F shear force
s
l length of the weld (cross joint)
l overall lap length
o
L minimum length of the test specimen
min
r radius of bent reinforcing steel bar
R specified characteristic yield strength of the reinforcing steel
e
R nominal tensile strength of the reinforcing steel
m
S shear factor
f
s throat thickness for butt weld
t thickness of the web of a section or of a plate to be welded
t minimum thickness of the web of a section or of a plate to be welded
min
w weld width
x root gap
y depth of root face
z, z , z leg length
1 2
α included angle
BW butt weld
CEV carbon equivalent value
FW fillet weld
SF shear factor class
WPQR welding procedure qualification record
WPS welding procedure specification
ISO/DIS 17660:2021(E)
5 Welding processes
The following welding processes in accordance with ISO 4063 may be used (see Table 1):
Table 1 — List of welding processes and reference numbers in accordance with ISO 4063
Welding process English term American term
Manual metal-arc welding
111 Shielded metal-arc welding
(Metal-arc welding with covered electrode)
114 Self-shielded tubular cored arc welding
Gas metal-arc welding using inert
131 MIG welding with solid wire electrode
gas and solid wire electrode
Gas metal-arc welding using active
135 MAG welding with solid-wire electrode
gas with solid-wire electrode
Gas metal-arc welding using active
136 MAG welding with flux-cored electrode
gas and flux-cored electrode
Gas metal-arc welding using active
138 MAG welding with metal-cored electrode
gas and metal-cored electrode
Gas tungsten-arc welding using
141 TIG welding with solid filler material (wire/rod) inert gas and solid filler material
(wire/rod)
21 Resistance spot welding Spot welding
23 Projection welding
24 Flash welding
25 Resistance butt welding Upset welding
42 Friction welding
47 Oxyfuel gas pressure welding Pressure gas welding
The principles of this document may be applied to other welding processes.
6 Preparations and specifications for welded joints
6.1 General
For load-bearing welded joints, minimum joint strength depending on the type of welded joint with
stipulated welding process is given in Table 2. The shear strength for cross joints shall be specified in
the design (see also Annex E).
For non-load-bearing welded joints, lap joint or cross joint is applicable and minimum joint strength
is not required generally. Peculiar strength for the joint or measures to avoid influence in the load-
bearing capacity or ductility of the bars shall be specified in the design.
Table 2 — Minimum strength of load-bearing welded joints
Type of welded joint Recommended welding process Minimum joint strength
111, 114
butt joint 135, 136, 138, 141, 24, 25
42, 47
a
d / d should be ≥ 0,2.
min max
4 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
Table 2 (continued)
Type of welded joint Recommended welding process Minimum joint strength
111, 114
axial load with full load-bearing capaci-
lap joint / strap joint
ty of the bar
135, 136, 138, 141
111, 114
joint to other steel component 135, 136, 138, 141
111, 114
shear with the product of shear factor
a
cross joint
and nominal yield capacity of the bar
135, 136, 138, 141, 21, 23
a
d / d should be ≥ 0,2.
min max
The joints specified below are examples of good practice, see from 6.2 to 6.6. Other joint configurations
may be used if they can be shown to meet the requirements of Clause 11.
6.2 Butt joints
6.2.1 Butt joints welded by welding process 111, 114, 135, 136, 138 or 141
Examples of butt-joint preparation for load-bearing welded joints are given in Figure 1 a) to d). Other
joint preparations or types of permanent backing may also be used.
The prepared joint shall be bevelled. The joint preparation should be carried out by grinding or flame
cutting.
a) Double-V butt weld b) Single-V butt weld
c) Double-bevel butt weld d) Single-V butt weld with backing
Key
x root gap
y depth of root face
NOTE x or y depends on the welding process.
Figure 1 — Examples for the preparation of butt joints
ISO/DIS 17660:2021(E)
6.2.2 Butt joints welded by welding process 24, 25 or 42
For welding process 24 or 25, the misalignment of the bars shall not exceed 1 mm for nominal bar
diameters less than or equal to 10 mm, and 10 % of the nominal bar diameter for the other values.
For welding process 24 or 25, only bars with the same diameter shall be welded together.
For welding process 42, the maximum misalignment of the bars shall be specified.
6.2.3 Butt joints welded by welding process 47
The bars with different diameter shall not be welded in case that the difference of their nominal
diameter exceeds 7 mm.
The misalignment of the bars shall not exceed 20 % of the smaller nominal bar diameter of the two
welded bars.
An example of the joint preparation for welding process 47 is given in Figure 2.
Key
X root gap = 0 mm
Figure 2 — Example for the preparation of butt joints (Oxy-fuel gas pressure welding)
6.3 Lap joints
For load-bearing welded joints, lap joints using intermittent single-flare V-groove welds (asymmetric
force flow) shall be welded in accordance with Figure 3.
Key
1 weld
d , d nominal diameter of the welded b
1 2
a throat thickness
d nominal diameter of the thinner of the two welded bars
l overall lap length
o
w weld width
NOTE Welding is also possible on both sides with minimum weld length of 2,5 d. A conservative estimate of
the effective throat thickness can be taken as a ≈ 0,5 w.
Figure 3 — Load-bearing lap joint
6 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
Specifications in Figure 3 are not required for non-load-bearing welded joints. An example of a non-
load-bearing lap joints is given in Figure 4.
l ≥ 2d , d ≤ d
1 1 2
Key
l length of the weld
d , d nominal diameter of the welded b
1 2
Figure 4 — Non-load-bearing lap joint
6.4 Strap joints
For load-bearing strap joints with single-flare V-groove welds shall be welded in accordance with
Figure 5.
Where the straps and the bars have the same mechanical properties, the combined cross-sectional area
of the two straps shall be equal to or greater than the cross-sectional area of the bars to be joined.
Where the straps and the bars do not have the same mechanical properties, the cross-sectional area of
the straps shall be adapted on the basis of the ratio of their individual nominal yield stresses.
Key
1 weld
a throat thickness
d nominal diameter of the thinner of the welded bars with ϕdb and the strap with ϕds
w weld width
NOTE Welding is also possible on both sides with minimum weld length of 2,5 d. A conservative estimate of
the effective throat thickness can be taken as a ≈ 0,4 w.
Figure 5 — Strap joint
ISO/DIS 17660:2021(E)
6.5 Cross joints
6.5.1 General
For load-bearing cross joints, the required shear factor, S , of the joint shall be specified on the drawings
f
(for shear factor classification, see Annex E) and shall be verified by testing in accordance with
Clause 13.
6.5.2 Cross joints for welding process 111, 114, 135, 136, 138 or 141
For load-bearing welded joints, cross joints shall be welded in accordance with Figure 6. The joint shall
be welded, whenever possible, from at least two sides with two equal welds (see Figure 6 a)).
If only one single-sided weld is used, the shear strength of the welded joint shall be verified with the
force applied as shown in Figure 6 b).
To avoid cracks in the weld, the following conditions shall be fulfilled:
a) a minimum throat thickness a ≥ 0,3 d ;
min
b) a minimum length of the weld l ≥ 0,5 d .
min
If more than one transverse bar is used on the same side of the longitudinal bar, the spacing of the
transverse bars shall be at least three times the nominal diameter of the transverse bar.
For a non-load-bearing joint, the single-sided weld may be used as shown in Figure 6 b).
a) Double-sided weld
b) Single-sided weld
Key
1 longitudinal bar
2 transverse bar
a throat thickness
d nominal diameter of the welded bar
F force to be anchored by transverse bar
Figure 6 — Cross joint welded by welding process 111, 114, 135, 136, 138 or 141
8 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
6.5.3 Cross joints for welding process 21 or 23
Cross joints made by welding process 21 or 23 shall be welded in accordance with Figure 7. This type of
welded joint is used for both load-bearing joints and non-load-bearing joints.
Figure 7 — Cross joint welded by welding process 21 or 23
6.6 Joints between reinforcing steel bars and other steel components
6.6.1 General
The material thicknesses of the steel components given in Figures 8 to 11 are prescribed on the basis of
welding criteria. Greater material thicknesses can be required as a result of detailed structural analysis.
If the weld length or material thickness of the steel components vary from the values prescribed in
Figures 8, 9, 10 and 11, then the alternative dimensions shall be proven by data provided from actual
tests.
The details of such tests shall be specified and documented.
The choice of material, calculation and design of the steel component shall be made in accordance with
relevant design specifications.
Welded joints between reinforcing steel in accordance with 7.1.1 and stainless steels or fine-grained
structural steels are permitted.
6.6.2 Types of joint
6.6.2.1 Flare-bevel-groove weld joints
Load-bearing flare-bevel groove welds are shown in Figures 8 and 9. The joints welded by single-flare-
bevel groove welds shall be welded in accordance with the dimensions for a lap joint (see 6.3) and
double-flare-bevel groove welds shall be welded in accordance with the dimensions for a strap joint
(see 6.4).
ISO/DIS 17660:2021(E)
0,4 d ≤ t, but t = 4 mm
min
a) Single-flare-bevel groove joint
0,4 d ≤ t, but t = 4 mm
min
b) Double-flare-bevel groove joint
Key
1 weld
d nominal diameter of the welded bars
e distance between the bars
t thickness of the web of a section or of a plate to be welded
t minimum thickness of the web of a section or a plate to be welded
min
Figure 8 — Flare-bevel groove joint on straight reinforcing steel bars
10 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
Key
1 weld
d nominal diameter of the welded bars
t thickness of the web of a section or of a plate to be welded
Figure 9 — Double-flare-bevel groove joint on bent reinforcing steel bar
For the thickness of the steel components, the weld length and the weld spacing, the dimensions of
Figures 8 and 9 shall be observed.
For welding double-flare-bevel groove welds on bent reinforcing steel bars in accordance with Figure 9,
the requirements of 13.2 also apply.
During assembly, sufficient access for welding shall be maintained.
Single-flare-bevel groove welds shall be made as shown in Figure 10.
w ≥ 0,5d, minimum 6 mm
Key
a nominal throat thickness
d nominal diameter of the welded bar
w weld width
z , z leg length
1 2
NOTE a ≈ 0,5 ✕ w ≈ 0,7 ✕ z
1,2
Figure 10 — Single-flare-bevel groove weld
6.6.2.2 Transverse end-plate joints
Transverse end-plate joints should be welded in accordance with Figure 11.
ISO/DIS 17660:2021(E)
Where several reinforcing steel bars are welded to a plate or section, the spacing between bars shall be
at least 3d.
NOTE This type of joint can be used for the purposes of end anchorage.
For joints made by fillet welds with set-on bar, as shown in Figure 11 c), the end of the reinforcing steel
bar shall be cut square to the bar axis.
There shall be no gap between the squared end of the reinforcing steel bar and the steel component.
Laminations and lamellar tearing in the steel plate shall be avoided by the choice of a suitable parent
material.
The steel plate shall be tested, e.g. in accordance with EN 10164.
a = 0,4 d
b ≥ d,
0,4 d ≤ t, but t = 4 mm
min
a) Set-through bar
α ≥ 45°
s = 0,4 d
t ≥ d
b) Set-in bar
12 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
a = 0,4 d
0,4 d ≤ t, but t = 4 mm
min
In case of an incorrect root gap for fillet welds (No. 617) - ISO 6520-1, the throat thickness shall be
increased by a corresponding increase in throat thickness.
c) Set-on bar
Key
a throat thickness
b excess of the bar
d nominal diameter of the welded bar
s penetration depth
t plate thickness
t minimum thickness of the web of a section or of a plate to be welded
min
α included angle
Figure 11 — Transverse end-plate joint
7 Materials
7.1 Parent materials
7.1.1 Reinforcing steels
Weldable reinforcing steel and stainless reinforcing steel, in accordance with the relevant standards or
technical specification, may be used. For refurbishment and extensions of buildings, the weldability of
the existing reinforcing steel shall be verified.
7.1.2 Inspection documents
For reinforcing steels, the inspection certificate does not need to be provided if the manufacturer of the
reinforcing steel is certified to the relevant product standard for the market.
The carbon equivalent value (CEV), the manufacturing route and the delivery conditions shall be
determined before welding, when an inspection certificate is required.
This requirement for the CEV does not apply if:
a) the weldability is proven by a welding procedure test with a maximum CEV allowed in accordance
with the relevant product standard; or
b) it can be proven that the steel delivered has an equal or lower CEV than the steel used in the welding
procedure test.
ISO/DIS 17660:2021(E)
For reinforcing and structural steels, the CEV shall be in accordance with the product standard, and
CEV shall be calculated in accordance with Formula (1):
Mn Cr++Mo VNiC+ u
CEVC=+ + + (1)
65 15
The requirement for the CEV does not apply to stainless steel.
7.2 Welding consumables
The welding consumables to be used shall be qualified in accordance with the relevant standard.
For load-bearing welded joints, the specified minimum yield strength of the welding consumables shall
be at least 70 % of the specified minimum yield strength of the reinforcing steel. For load-bearing butt
welded joints, the specified minimum yield strength of the welding consumables shall be equal to or
greater than the specified minimum yield strength of the reinforcing steel to be welded.
NOTE Some application standards do not allow for the use of undermatching filler metals.
8 Quality requirements
For load-bearing welded joints, manufacturers which perform shop- or site-welding of load-bearing
welded joints with reinforcing steel shall fulfil the quality requirements of ISO 3834-3. For non-load-
bearing welded joints, the quality requirements of ISO 3834-4 shall be fulfilled.
9 Welding personnel
9.1 Welding coordination
Load-bearing welded joints shall be controlled by a welding coordinator conforming to the requirements
of ISO 14731, with specific technical knowledge in the welding of reinforcing steel.
NOTE 1 The technical knowledge of a welding coordinator for welding reinforcing steel shall be attained by a
special course or national training programs.
NOTE 2 For the surveillance of the welding works, the welding coordinator can be assisted by employees of
the manufacturer with sufficient welding training or experience. This does not affect the responsibility of the
welding coordinator.
9.2 Welder and operator qualifications
9.2.1 Welders for load-bearing welded joints
For welding processes 111, 114, 135, 136, 138 and 141, welders shall be suitably qualified to carry out
the welding procedures. To perform load-bearing welded joints on reinforcing steel bars, the welder
shall be qualified with test pieces according to Table 3, which shall cover the most critical welding
conditions in production (e.g. dimensions, welding positions).
The test pieces shall be evaluated as specified in Table 3 and the positive result shall be confirmed by
the welding coordinator (see Annex C).
14 © ISO 2021 – All rights reserved
ISO/DIS 17660:2021(E)
Table 3 — Number of test pieces
Number of test Type of test for the test piece in accord-
Joint
pieces ance with this document
a
Butt joint 3 tensile test
b
Lap joint 3 tensile test or macro test
c
Cross joint 4 2 shear test, 2 tensile test
d
Other joints 3 tensile test
a
In accordance with Figure 1 or 2.
b
In accordance with Figure 3
c
In accordance with Figures 6 or 7.
d
In accordance with Figures 8, 9, 10, or 11.
For welding process 47, welders shall be qualified in accordance with national standards or other
standards that provide equivalent technical conditions.
The welder qualification is valid for each qualified welding process. The range of welder qualification
according to the type of welding joints is given in Table 4.
Table 4 — Range of welder qualification according to joint type
Range of qualification
Type of joint during
Lap joint/
verification b, c
Butt joint Cross joint Other joints
Strap joint
Butt joint x
Cross joint x
Lap joint x x
flare-bevel-groove
x x
a
weld joint
NOTE Symbol x indicates those welding joints for which the welder is qualified and symbol
indicates those welding joints for which the welder is not qualified.
a
In accordance with Figure 8, 9 or 10.
b
In accordance with Figure 8, 9, 10 or 11.
c
Lap joint not covers Figure 11 c).
The range of welder qualification according to welding position for welding process 111, 114, 135, 136,
138 and 141 is given in Table 5.
Table 5 — Range of welder qualification according to welding position for welding processes
111, 114, 135, 136, 138 and 141
Welding position Range of qualification
during verifica-
PA PB PC PD PE PF PG
tion
PA x
PB x x
PC x x x
PD x x x x x
PE x x x x x
PF x x x
PG x
NOTE Symbol x indicates those welding positons for which the welder is qualified and symbol indicates those welding
positions for which the welder is not qualified.
ISO/DIS 17660:2021(E)
The welder shall be qualified separately for carbon steels and stainless steels. Qualification with
stainless steel qualifies for stainless steel to carbon steel.
The range of welder qualification according to diameter of reinforcing steel bar and material thickness
is given in Table 8 (see subclause 11.5.3).
9.2.2 Welding operators and resistance weld setters for load-bearing welded joints
Welding operators and resistance weld setters of fully mechanized or automated welding shall hold
a valid operator qualification test certificate, in accordance with ISO 14732 or applicable standard,
carried out on reinforcing steel.
9.2.3 Welders for non-load-bearing welded joints
The welders shall receive training on the welding of non-load-bearing joints. At the end of the training
period, the welders shall weld at least one test piece, which shall be evaluated accordance to Table 3.
Welder for load-bearing welds qualifies for non-load-bearing welds.
9.3 Validity of qualification test certificate of welder and welding operator
The validity of a welder qualification test certificate to weld reinforcing steel shall be in accordance
with ISO 9606-1 or other standards that provide equivalent technical conditions.
The validity of a welding operator qualification test certificate to weld reinforcing steel shall be in
accordance with ISO 14732.
10 Welding procedure
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