prEN ISO 17632

• Abstract:

  ISO 17632:2015 specifies requirements for classification of tubular cored electrodes with or without a gas shield for metal arc welding of non-alloy and fine grain steels in the as-welded condition or in the post-weld heat-treated condition with a minimum yield strength of up to 500 MPa or a minimum tensile strength of up to 570 MPa. One tubular cored electrode can be tested and classified with different shielding gases, if any.; This International Standard is a combined specification providing classification utilizing a system based upon the yield strength and the average impact energy of 47 J of all-weld metal or utilizing a system based upon the tensile strength and the average impact energy of 27 J of all-weld metal.; 1) Paragraphs and tables which carry the suffix letter "A" are applicable only to tubular cored electrodes classified to the system based upon the yield strength and the average impact energy of 47 J of all-weld metal in accordance with this International Standard.; 2) Paragraphs and tables which carry the suffix letter "B" are applicable only to tubular cored electrodes classified to the system based upon the tensile strength and the average impact energy of 27 J of all-weld metal in accordance with this International Standard.; 3) Paragraphs and tables which have neither the suffix letter "A" nor the suffix letter "B" are applicable to all tubular cored electrodes classified in accordance with this International Standard.; It is recognized that the operating characteristics of tubular cored electrodes can be modified by the use of pulsed current, but for the purposes of this International Standard, pulsed current is not permitted for determining the electrode classification.

• Status: Not Published
• Publication Date: 09-Apr-2028
• ICS: 25.160.20 - Welding consumables
• Technical Committee: CEN/TC 121 - Welding
• Drafting Committee: CEN/TC 121/WG 3 - Welding consumables
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 22-Oct-2026
• Completion Date: 22-Oct-2026
• Ref Project: oSIST prEN ISO 17632:2026 - Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of non-alloy and fine grain steels - Classification (ISO/DIS 17632:2026)

• Revises: EN ISO 17632:2015 - Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of non-alloy and fine grain steels - Classification (ISO 17632:2015)
• Effective Date: 23-Jul-2025

prEN ISO 17632 is the CEN draft aligned with ISO/DIS 17632:2026, published under the title Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of non-alloy and fine grain steels - Classification. It specifies how these tubular cored electrodes are classified for manufacturers, purchasers, welding engineers, and quality teams by strength, impact performance, chemical composition, shielding gas, welding position, hydrogen content, and post-weld heat treatment condition.

What does prEN ISO 17632 specify?

prEN ISO 17632 specifies classification requirements for tubular cored electrodes used for metal arc welding of non-alloy and fine grain steels in the as-welded condition or after post-weld heat treatment. The scope covers steels with a minimum yield strength up to 500 MPa or a minimum tensile strength up to 570 MPa.

The document uses two classification systems:

• System A - based on yield strength and 47 J average impact energy of all-weld metal.
• System B - based on tensile strength and 27 J average impact energy of all-weld metal.

A single electrode can be tested and classified with different shielding gases where applicable. Pulsed current is acknowledged as affecting operating characteristics, but it is not used to determine the classification.

Annex	What it covers
Annex A	The two classification systems and how the designators fit together
Annex B	Types of electrode core used in System A
Annex C	Usability characteristics used in System B
Annex D	Notes on hydrogen content and its practical meaning

What are the key requirements of prEN ISO 17632?

prEN ISO 17632 builds the designation from compulsory symbols, with optional symbols added where relevant. In practice, this is the code that appears on packages, product literature, and data sheets, so it is the main way to identify what an electrode is intended to do.

Classification and designation structure

The designation starts with T for tubular cored electrode. It then adds symbols for tensile properties, impact properties, chemical composition, core type or usability characteristics, shielding gas, welding position, hydrogen content, and, in System B, the post-weld heat treatment condition.

System A and System B do not use the same property symbols. That matters because the same commercial product can often be classified in both systems, but the designation language and supporting tables are different.

Strength and impact performance

For multi-run techniques, System A classifies by yield strength and elongation of all-weld metal, while System B classifies by tensile strength and elongation. For single-run techniques, the standard classifies the welded joint against the parent material used in the test.

Impact performance is tied to the classification system and the chosen test temperature. System A uses a 47 J requirement, while System B uses a 27 J requirement, with an optional supplemental designator for 47 J in System B. For the user, that means the designation tells you not only the strength level but also the toughness level the consumable has been tested to meet.

Test methods and specimen conditions

System A uses multi-run all-weld metal testing in the as-welded condition. System B can use the as-welded condition, the post-weld heat-treated condition, or both, depending on how the product is classified. For System B, the symbol A, P, or AP identifies the condition.

The standard also distinguishes between multi-run and single-run techniques. Products suitable for both single- and multi-run welding do not need the single-run test, which helps avoid unnecessary testing when the broader classification already applies.

Welding and heat-treatment conditions

For System A, no preheating is required and the interpass temperature is limited. For System B, preheating and interpass temperature are selected from the stated table for the relevant composition designation. If the classification includes post-weld heat treatment, the test assembly is heat treated under the specified furnace and holding conditions before testing.

These controls matter because classification is only valid when the test weld is made under the required thermal conditions. A welding team cannot assume a classification applies if the procedure used for testing was outside the stated limits.

Chemical composition, gas, position, and hydrogen

The standard classifies all-weld metal chemistry with separate tables for System A and System B. It also uses symbols for shielding gas in line with ISO 14175, except that NO is used for non-gas shielded tubular cored electrodes. Welding position is coded by the listed positions, and hydrogen content is identified with H5, H10, or H15.

This matters in procurement and procedure selection because the designation tells you whether the electrode has been classified for the position, shielding gas, and hydrogen level needed by the application. When hydrogen content is part of the designation, the manufacturer must state the handling and operating limits needed to stay within that hydrogen level.

Verification, rounding, and retesting

Mechanical tests are performed according to the referenced ISO test methods, and chemical analysis follows the stated pad or all-weld metal methods. Results are rounded using ISO 80000-1 rules, and retests are required if a test fails.

For a buyer or quality manager, that means the classification is not based on informal trial welding. It depends on defined test assemblies, accepted calculation rules, and repeat testing when results do not meet the specified requirement.

What changed in prEN ISO 17632 from the previous edition?

prEN ISO 17632 is described as the third edition and it cancels and replaces ISO 17632:2015. The foreword states that the document has been technically revised.

Which standards are used with prEN ISO 17632?

prEN ISO 17632 relies on several referenced standards that supply the test and purchasing framework around the classification:

• ISO 544 - technical delivery conditions, including product type, dimensions, tolerances, and markings.
• ISO 3690 - determination of hydrogen content in arc weld metal.
• ISO 6847 - deposition of a weld metal pad for chemical analysis.
• ISO 14175 - gas and gas mixtures for fusion welding and allied processes.
• ISO 14344 - procurement of filler materials and fluxes.
• ISO 15792-1:2020 - preparation of all-weld metal test pieces and specimens.
• ISO 15792-2:2020 - preparation of single-run and two-run technique test pieces and specimens.
• ISO 80000-1:2022 - quantities and units, including the rounding rule used for reported values.
• ISO 13916 - cited for measuring preheating and interpass temperature.

These references show that prEN ISO 17632 is not just a naming scheme. It connects classification to the actual test, measurement, and procurement methods used in welding practice.

What does the prEN ISO 17632 document contain?

prEN ISO 17632 contains 11 clauses, 4 informative annexes, a bibliography, and worked designation examples. Clause 4 sets out the two classification systems and the compulsory and optional sections of the designation.

Clause 5 gives the symbols for product type, strength, impact properties, chemical composition, core or usability type, shielding gas, welding position, hydrogen content, and post-weld heat treatment condition. Clause 6 describes the mechanical test assemblies, welding conditions, pass and layer sequences, interpass control, and PWHT conditions used to qualify the classification.

Clause 7 covers chemical analysis, Clause 8 gives the rounding procedure, and Clause 9 covers retests. Clause 10 links the document to delivery conditions, and Clause 11 shows designation examples for both systems. Annexes A to D explain the classification logic, the core types, the usability characteristics, and hydrogen-related notes that help users interpret the symbols in practice.

SLOVENSKI STANDARD
01-december-2026
Dodajni in pomožni materiali za varjenje - Strženske žice za obločno varjenje v
zaščitnem plinu in brez zaščite za nelegirana in drobnozrnata jekla - Razvrstitev
(ISO/DIS 17632:2026)
Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded
metal arc welding of non-alloy and fine grain steels - Classification (ISO/DIS 17632:2026)
Schweißzusätze - Fülldrahtelektroden zum Metall-Lichtbogenschweißen mit und ohne
Schutzgas von unlegierten Stählen und Feinkornstählen - Einteilung (ISO/DIS
17632:2026)
Produits consommables pour le soudage - Fils-électrodes fourrés pour soudage à l'arc
avec ou sans gaz de protection des aciers non alliés et des aciers à grains fins -
Classification (ISO/DIS 17632:2026)
Ta slovenski standard je istoveten z: prEN ISO 17632
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 17632
ISO/TC 44/SC 3
Welding consumables — Tubular
Secretariat: ANSI
cored electrodes for gas shielded
Voting begins on:
and non-gas shielded metal arc
2026-10-19
welding of non-alloy and fine grain
Voting terminates on:
steels — Classification
2027-01-11
Produits consommables pour le soudage — Fils-électrodes
fourrés pour soudage à l'arc avec ou sans gaz de protection des
aciers non alliés et des aciers à grains fins — Classification
ICS: 25.160.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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.
Reference number
ISO/DIS 17632:2026(en)
DRAFT
ISO/DIS 17632:2026(en)
International
Standard
ISO/DIS 17632
ISO/TC 44/SC 3
Welding consumables — Tubular
Secretariat: ANSI
cored electrodes for gas shielded
Voting begins on:
and non-gas shielded metal arc
welding of non-alloy and fine grain
Voting terminates on:
steels — Classification
Produits consommables pour le soudage — Fils-électrodes
fourrés pour soudage à l'arc avec ou sans gaz de protection des
aciers non alliés et des aciers à grains fins — Classification
ICS: 25.160.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 17632:2026(en)
ii
ISO/DIS 17632:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
4.1 General .2
4.2 Classification systems .2
4.3 Compulsory and optional sections .3
5 Symbols and requirements . 3
5.1 Symbol for the product/process .3
5.2 Symbol for tensile properties of all-weld metal or welded joint .4
5.2.1 Multi-run technique . .4
5.2.2 Single-run technique .4
5.3 Symbol for impact properties of all-weld metal or welded joint .5
5.4 Symbol for chemical composition of all-weld metal.5
5.5 Symbol for type of electrode core or for the usability characteristics of the electrode .8
5.5.1 System A . .8
5.5.2 System B .8
5.6 Symbol for shielding gas .10
5.7 Symbol for welding position .10
5.8 Symbol for hydrogen content of deposited metal.10
5.9 Symbol for condition of postweld heat treatment of all-weld metal .10
5.9.1 System A . .10
5.9.2 System B .11
6 Mechanical tests .11
6.1 Multi-run technique .11
6.1.1 System A . .11
6.1.2 System B .11
6.1.3 Hydrogen removal .11
6.1.4 Preheating and interpass temperatures .11
6.1.5 Procedure requirements for welding multi-run test assemblies . 12
6.1.6 Post-weld heat treatment (PWHT) condition . 12
6.2 Single-run technique . 12
7 Chemical analysis . .13
8 Rounding procedure .13
9 Retests .13
10 Technical delivery conditions .13
11 Examples of designation .13
11.1 General . 13
11.2 Example 1 – System A . . 13
11.3 Example 2 – System B .14
11.4 Example 3 - System A . . 15
11.5 Example 4 – System B . 15
11.6 Example 5 – System A . .16
Annex A (informative) Classification systems . 17
Annex B (informative) Description of types of electrode core in the classification system based
upon yield strength and average impact energy of 47 J .20

iii
ISO/DIS 17632:2026(en)
Annex C (informative) Description of types of usability characteristics in the classification
system based upon tensile strength and average impact energy of 27 J .22
Annex D (informative) Notes on hydrogen content .25
Bibliography .26

iv
ISO/DIS 17632:2026(en)
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 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 44, Welding and allied processes, Subcommittee SC 3,
Welding consumables.
[1]
This third edition cancels and replaces the second edition (ISO 17632:2015 ), which has been technically
revised.
Requests for official interpretations of any aspect of this document should be directed to the Secretariat
of ISO/TC 44/SC 3, through your national standards body, a complete listing of which can be found at
www.iso.org.
v
ISO/DIS 17632:2026(en)
Introduction
This document provides a classification system for tubular cored electrodes in terms of tensile properties,
impact properties, chemical composition of the all-weld metal, type of electrode core, shielding gas, and
welding position. The ratio of yield to tensile strength of weld metal is generally higher than that of the
parent metal. Matching weld metal yield strength to parent metal yield strength will not necessarily ensure
that the weld metal tensile strength matches that of the parent metal. Where the application demands
matching tensile strengths, selection of consumables is made by reference to Table 3, column 3 or 7, Tensile
strength or Table 4, column 3 or 5, Minimum tensile strengths.
Of note is that the mechanical properties of all-weld metal test specimens used to classify the tubular
cored electrodes will vary from those obtained in production joints because of the differences in welding
procedure such as electrode size, width of weave, welding position, and parent metal composition.
The classification in accordance with System A is mainly based on EN 758:1997. The classification in
accordance with System B is mainly based upon standards used around the Pacific Rim.

vi
DRAFT International Standard ISO/DIS 17632:2026(en)
Welding consumables — Tubular cored electrodes for gas
shielded and non-gas shielded metal arc welding of non-alloy
and fine grain steels — Classification
1 Scope
This document specifies requirements for classification of tubular cored electrodes with or without a gas
shield for metal arc welding of non-alloy and fine grain steels in the as-welded condition or in the post-weld
heat-treated condition with a minimum yield strength of up to 500 MPa or a minimum tensile strength of up
to 570 MPa. One tubular cored electrode can be tested and classified with different shielding gases, if any.
This document is a combined specification providing classification utilizing a system based upon the yield
strength and the average impact energy of 47 J of all-weld metal or utilizing a system based upon the tensile
strength and the average impact energy of 27 J of all-weld metal.
a) Clauses, subclauses and tables which carry the suffix “System A” are applicable only to tubular cored
electrodes classified to the system based upon the yield strength and the average impact energy of 47 J
of all-weld metal in accordance with this document.
b) Clauses, subclauses and tables which carry the suffix “System B” are applicable only to tubular cored
electrodes classified to the system based upon the tensile strength and the average impact energy of 27
J of all-weld metal in accordance with this document.
c) Clauses, subclauses and tables which have neither the suffix "System A” nor the suffix "System B” are
applicable to all tubular cored electrodes classified in accordance with this document.
It is recognized that the operating characteristics of tubular cored electrodes can be modified by the use
of pulsed current, but for the purposes of this document Standard, pulsed current is not to be used for
determining the electrode classification.
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 544, Welding consumables — Technical delivery conditions for filler materials and fluxes — Type of product,
dimensions, tolerances and markings
ISO 3690, Welding and allied processes — Determination of hydrogen content in arc weld metal
ISO 6847, Welding consumables — Deposition of a weld metal pad for chemical analysis
ISO 14175, Welding consumables — Gases and gas mixtures for fusion welding and allied processes
ISO 14344, Welding consumables — Procurement of filler materials and fluxes
ISO 15792-1:2020, Welding consumables — Test methods — Part 1: Preparation of all-weld metal test pieces
and specimens in steel, nickel and nickel alloys
ISO 15792-2:2020, Welding consumables — Test methods — Part 2: Preparation of single-run and two-run
technique test pieces and specimens in steel
ISO 80000-1:2022, Quantities and units — Part 1: General

ISO/DIS 17632:2026(en)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology 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/
4 Classification
4.1 General
Classification designations are based upon two approaches, A and B, to indicate the tensile properties and
the impact properties of the all-weld metal obtained with a given electrode.
System A is applicable to tubular cored electrodes classified under the system based on the yield strength
and an average impact energy of 47 J of the all-weld metal given in this document.
System B is applicable to tubular cored electrodes classified under the system based on the tensile strength
and an average impact energy of 27 J of the all-weld metal given in this document.
The two designation approaches include additional designators for some other classification requirements,
but not all as will be clear from the following. In most cases, a given commercial product can be classified
in both systems. Then, either or both classification designations can be used for the product (see Annex A).
The classification includes all-weld metal properties obtained with a tubular cored electrode and appropriate
shielding gas combination as given below. The classification of gas shielded tubular cored electrodes is based
on the 1,2 mm electrode size or if this size is not manufactured, the next larger diameter manufactured.
The classification of self-shielded tubular cored electrodes is based on the 2,4 mm diameter or the largest
diameter manufactured if less than 2,4 mm.
4.2 Classification systems
Each classification system, A and B, is split into parts as given in Table 1.
Table 1 — Classification systems
Part of Classification system
classification
System A System B
designation
1 Symbol T indicates a tubular cored electrode.
Symbol indicating the yield strength and elongation Symbol indicating the tensile strength and elon-
of all-weld metal for multi-run technique or the gation of all-weld metal for multi-run technique
2 strength of the parent material used in classification or the strength of the parent material used in
for the single-run technique (see Table 3 or Table 4). classification for the single-run technique (see
Table 3 or Table 4).
Symbol indicating the impact properties of all-weld Symbol indicating the impact properties of all-
metal or welded joint (see Table 5). weld metal (see Table 5). The symbol “U” added
as an optional supplemental designator at or near
3 the end of the complete tubular cored electrode
designation indicates that the deposit meets an
average optional requirement of 47 J at the desig-
nated Charpy test temperature.
Symbol indicating the chemical composition of Symbol indicating the usability characteristics of
all-weld metal (see Table 6). the electrode (see Table 9).
Symbol indicating the type of electrode core (see Symbol indicating the welding position (see Table 9).
Table 8).
ISO/DIS 17632:2026(en)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Part of Classification system
classification
System A System B
designation
Symbol indicating the shielding gas (see 5.6). Symbol indicating the shielding gas (see 5.6). The
6 letter “S” added to this designator indicates that
the electrode is classified for single-pass welding.
Symbol indicating the welding position (see Symbol indicating whether the classification tests
Table 10); were conducted in the as-welded (A) or post-weld
heat-treated condition (P). If the electrode has
been classified in both conditions, the symbol AP
shall be added to the classification. This designa-
tor is omitted in the classification for single-pass
welding electrodes as these are tested only in the
as-welded condition.
Symbol indicating the hydrogen content of depos- Symbol indicating the chemical composition of all-
ited metal (see Table 11). weld metal (see Table 7). The symbol is omitted
for weld deposits conforming to the “No symbol”
in Table 7.
Symbol indicating the hydrogen content of depos-
ited metal (see Table 11).
9 —
Electrodes can be classified under any number of
classifications for either or both the as-welded and
post-weld heat-treated condition.
For both Systems A and B, the electrode classification shall include all compulsory sections and can include
optional sections as outlined in 4.3.
4.3 Compulsory and optional sections
The compulsory and optional sections are given in Table 2.
The full designation shall comprise the compulsory symbols and can include optional symbols chosen by
the manufacturer. The full designation (see Clause 10) shall be used on packages and in the manufacturer’s
literature and data sheets.
Table 2 — Compulsory and optional sections
Classification system
Section
System A System B
includes the symbols for type of product, strength includes the symbols for type of product, strength
and elongation, impact properties, chemical compo- and elongation in the as-welded condition or post-
sition, type of electrode core, and shielding gas, i.e. weld heat-treated condition, welding positions for
Compulsory the symbols defined in 5.1, 5.2, 5.3, 5.4, 5.5, and 5.6. which the electrode is suitable, usability charac-
teristics, shielding gas, impact properties, and
chemical composition, i.e. the symbols defined in
5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, and 5.9.
includes the symbols for the welding positions for includes the symbol “U” to indicate that the weld
which the electrode is suitable and the symbol for metal has an average of 47 J impact energy at the
Optional hydrogen content, i.e. the symbols defined in 5.7 classification test temperature and the symbol
and 5.8. for hydrogen content, i.e. the symbol “U” defined
in 5.2 and the symbols defined in 5.8.
5 Symbols and requirements
5.1 Symbol for the product/process
The symbol for the tubular cored electrode used in the metal arc welding process is the letter T.

ISO/DIS 17632:2026(en)
5.2 Symbol for tensile properties of all-weld metal or welded joint
5.2.1 Multi-run technique
The symbols in Table 3 indicate:
a) System A – for products suitable for single- and multi-run welding, the symbol in Table 3 indicates yield
strength, tensile strength, and elongation of the all-weld metal in the as-welded condition determined in
accordance with 6.1.
b) System B – for electrodes suitable for single- and multi-run welding, the symbol in Table 3 indicates
yield strength, tensile strength, and elongation of the all-weld metal in the as-welded condition or in the
post-weld heat-treated condition determined in accordance with 6.1.
Classification of products suitable for both single- and multi-run welding does not require the single-run
test of 6.2.
Table 3 — Symbols for tensile properties – multi-run technique
System A System B
Minimum yield Tensile Minimum Minimum yield Tensile Minimum
a b a b
strength strength elongation strength strength elongation
Symbol Symbol
MPa MPa % MPa MPa %
35 355 440 to 570 22 43 330 430 to 600 20
38 380 470 to 600 20 49 390 490 to 670 18
42 420 500 to 640 20 55 460 550 to 740 17
46 460 530 to 680 20
57 490 570 to 770 17
50 500 560 to 720 18
a
For yield strength, the lower yield, R , is used when yielding occurs. Otherwise, the 0,2 % proof strength, R , is used.
eL p0,2
b
Gauge length is equal to five times the test specimen diameter.
5.2.2 Single-run technique
For tubular cored electrodes suitable for single-run welding only, the symbols in Table 4 indicate the
strength of the welded joint in the as-welded condition in relation to the parent material used in single-run
tests satisfactorily completed in accordance with 6.2.
Table 4 — Symbol for tensile properties by single-run technique
System A System B
Minimum parent Minimum tensile
Minimum tensile strength of the
material yield strength of the
parent metal and of the welded joint
Symbol Symbol
strength welded joint
MPa MPa MPa
3T 355 470 43 430
4T 420 520 49 490
55 550
5T 500 600
57 570
ISO/DIS 17632:2026(en)
5.3 Symbol for impact properties of all-weld metal or welded joint
The symbols in Table 5 indicate the temperature at which a minimum average impact energy of 47 J or 27 J is
achieved. The testing conditions for System A and System B are:
a) System A: the conditions given in 6.1 or 6.2 shall be followed.
Three test specimens shall be tested. Only one individual value can be lower than 47 J, but not lower
than 32 J.
b) System B: testing can be in the as-welded condition or in the post-weld heat-treated condition under the
conditions given in 6.1 or 6.2.
Five test specimens shall be tested. The lowest and highest values obtained shall be disregarded. Two
of the three remaining values shall be greater than or equal to the specified 27 J level. One of the three
can be lower, but shall be no less than 20 J. The average of the three remaining values shall be at least
27 J. Three test specimens shall be tested when the optional supplemental designator “ (see” is used
to indicate that the weld deposit will meet a minimum impact energy of 47 J at the test temperature.
The impact value shall be determined by the average of the three test specimens. The average of three
values shall be 47 J or greater. Only one individual value can be lower than 47 J, but not lower than 32 J.
When an all-weld metal has been classified for a certain temperature, it automatically covers any higher
temperature listed in Table 5.
NOTE Impact testing is not required to classify electrodes for the single-run technique.
Table 5 — Symbol for impact properties of all-weld metal or welded joint
a,b c
Temperature for minimum average impact energy of 47 J or 27 J
Symbol
°C
a
Z No requirements
b c
A or Y +20
0 0
2 −20
3 −30
4 −40
5 −50
6 −60
7 −70
8 −80
9 −90
10 −100
a
Only the symbol Z is used for electrodes for the single-run technique.
b
Classification by yield strength and 47 J impact energy.
c
Classification by tensile strength and 27 J impact energy.
5.4 Symbol for chemical composition of all-weld metal
The symbols in Table 6 for System A and Table 7 for System B indicate the chemical composition of all-weld
metal determined in accordance with Clause 7.

ISO/DIS 17632:2026(en)
Table 6 — System A symbols for chemical composition of all-weld metal
a, b
Chemical composition (percentage mass fraction)
Composition
c
designation
C Mn Si P S Cr Ni Mo V Nb Al Cu
No symbol — 2,0 — — — 0,2 0,5 0,2 0,08 0,05 2,0 0,3
Mo — 1,4 — — — 0,2 0,5 0,3 to 0,6 0,08 0,05 2,0 0,3
MnMo — 1,4 to 2,0 — — — 0,2 0,5 0,3 to 0,6 0,08 0,05 2,0 0,3
1Ni — 1,4 0,80 — — 0,2 0,6 to 1,2 0,2 0,08 0,05 2,0 0,3
1,5Ni — 1,6 — — — 0,2 1,2 to 1,8 0,2 0,08 0,05 2,0 0,3
2Ni — 1,4 — — — 0,2 1,8 to 2,6 0,2 0,08 0,05 2,0 0,3
3Ni — 1,4 — — — 0,2 2,6 to 3,8 0,2 0,08 0,05 2,0 0,3
Mn1Ni — 1,4 to 2,0 — — — 0,2 0,6 to 1,2 0,2 0,08 0,05 2,0 0,3
1NiMo — 1,4 — — — 0,2 0,6 to 1,2 0,3 to 0,6 0,08 0,05 2,0 0,3
d
Z Any other agreed composition
a
Single values are maximum values.
b
Analysis for boron is required if intentionally added.
c
Self-shielded electrodes only.
d
Consumables for which the chemical composition is not listed shall be symbolized similarly and prefixed by the letter Z. The chemical composition ranges are not specified and
therefore it is possible that two electrodes with the same Z classification are not interchangeable.

ISO/DIS 17632:2026(en)
Table 7 — System B symbols for chemical composition of all-weld metal
a,b
Chemical composition (percentage mass fraction)
Composition
c
designation
C Mn Si P S Cr Ni Mo Cu V Al
d e e e e
No symbol 0,18 2,00 0,90 0,030 0,030 0,20 0,50 0,30 — 0,08 2,0
e e e e
K 0,20 1,60 1,00 0,030 0,030 0,20 0,50 0,30 — 0,08 —
2M3 0,12 1,50 0,80 0,030 0,030 — — 0,40 to 0,65 — — 1,8
3M2 0,15 1,25 to 2,00 0,80 0,030 0,030 — — 0,25 to 0,55 — — 1,8
N1 0,12 1,75 0,80 0,030 0,030 — 0,30 to 1,00 0,35 — — 1,8
N2 0,12 1,75 0,80 0,030 0,030 — 0,80 to 1,20 0,35 — — 1,8
N3 0,12 1,75 0,80 0,030 0,030 — 1,00 to 2,00 0,35 — — 1,8
N5 0,12 1,75 0,80 0,030 0,030 — 1,75 to 2,75 — — — 1,8
N7 0,12 1,75 0,80 0,030 0,030 — 2,75 to 3,75 — — — 1,8
CC 0,12 0,60 to 1,40 0,20 to 0,80 0,030 0,030 0,30 to 0,60 — — 0,20 to 0,50 — 1,8
NCC 0,12 0,60 to 1,40 0,20 to 0,80 0,030 0,030 0,45 to 0,75 0,10 to 0,45 — 0,30 to 0,75 — 1,8
NCC1 0,12 0,50 to 1,30 0,20 to 0,80 0,030 0,030 0,45 to 0,75 0,30 to 0,80 — 0,30 to 0,75 — 1,8
N1M2 0,15 2,00 0,80 0,030 0,030 0,20 0,40 to 1,00 0,20 to 0,65 — 0,05 1,8
N2M2 0,15 2,00 0,80 0,030 0,030 0,20 0,80 to 1,20 0,20 to 0,65 — 0,05 1,8
N3M2 0,15 2,00 0,80 0,030 0,030 0,20 1,00 to 2,00 0,20 to 0,65 — 0,05 1,8
f
G Any other agreed composition
a
Single values s are maximum values.
b
Analysis for boron is required if intentionally added.
c
Self-shielded electrodes only.
d
0,30 % for self-shielded electrodes.
e
The analysis of these elements shall be reported only if added intentionally.
f
Consumables for which the chemical composition is not listed shall be symbolized by the letter G. The chemical composition ranges are not specified and therefore it is possible
that two electrodes with the same G classification are not interchangeable.

ISO/DIS 17632:2026(en)
5.5 Symbol for type of electrode core or for the usability characteristics of the electrode
5.5.1 System A
The symbols in Table 8 indicate different types of tubular cored electrodes relative to their core composition
and slag characteristics. Manufacturers shall provide information on recommended polarity.
Table 8 — System A symbols for type of electrode core
Symbol Characteristics Weld types Shielding gas
R Rutile, slow freezing slag Single and multiple pass Required
P Rutile, fast freezing slag Single and multiple pass Required
B Basic Single and multiple pass Required
M Metal powder Single and multiple pass Required
V Rutile or basic/fluoride Single pass Not required
W Basic/fluoride, slow freezing slag Single and multiple pass Not required
Y Basic/fluoride, fast-freezing slag Single and multiple pass Not required
Z Other types
NOTE A description of the characteristics of each of the core types is given in Annex B.
5.5.2 System B
The symbols in Table 9 indicate the usability characteristics of the electrode.

ISO/DIS 17632:2026(en)
Table 9 — System B usability characteristics
Usability Shielding Operating Transfer of Type of Welding
Characteristics Type of weld
a
designator gas polarity droplet core position
Low spatter loss, flat to slightly convex bead, and high Single and
T1 Required D.C.(+) Spray type Rutile 0 or 1
deposition rates multiple pass
Similar to “T1” type, higher manganese and/or silicon for
T2 Required D.C.(+) Spray type Rutile 0 Single pass
improved performance
Not Not
T3 D.C.(+) Globular type 0 Very high welding speeds Single pass
required specified
Not Very high deposition rates, excellent resistance to hot cracking Single and
T4 D.C.(+) Globular type Basic 0
required and low penetration multiple pass
Slightly convex bead, a thin slag without completely covering
Lime- Single and
T5 Required D.C.(+) Globular type 0 or 1 the weld bead, good impact properties, and hot and
fluoride multiple pass
cold crack resistance compared with “T1”
Not Not Good impact properties, good penetration into the root of the Single and mul-
T6 D.C.(+) Spray type 0
required specified weld and excellent slag removal even in a deep groove tiple pass
Not Small droplet Not Single and
T7 D.C.(−) 0 or 1 High deposition rates and excellent resistance to hot cracking
required to spray type specified multiple pass
Not A small droplet Not Single and
T8 D.C.(−) 0 or 1 Very good low temperature impact properties
required or spray type specified multiple pass
Not re- Not speci-
T10 D.C.(−) Small droplet 0 High travel speeds on any thickness Single pass
quired fied
Some electrodes are designed for thin plate only.
Not Not Single and mul-
T11 D.C.(−) Spray type 0 or 1 The manufacturer should be consulted regarding any plate
required specified tiple pass
thickness limitations.
Similar to “T1” type, improved impact properties, and lower Single and
T12 Required D.C.(+) Spray type Rutile 0 or 1
manganese requirements multiple pass
Not Short arc Not
T13 D.C.(−) 0 or 1 Welding for open gap root passes Single pass
required transfer specified
Not Not
T14 D.C.(−) Spray type 0 or 1 High speed welding on coated sheet steels Single pass
required specified
Very fine drop- Core consisting of metal alloys and iron powder and minimal Single and
T15 Required D.C.(+) Metal 0 or 1
let spray type slag cover multiple pass
b
TG As agreed between purchaser and supplier
NOTE A description of the usability characteristics of the electrodes is given in Annex C.
a
See Table 10.
b
For electrodes that are not covered by any currently defined usability designator.

ISO/DIS 17632:2026(en)
5.6 Symbol for shielding gas
The symbols for shielding gases shall be in accordance with ISO 14175 except that the symbol NO shall be
used for non-gas shielded tubular cored electrodes.
5.7 Symbol for welding position
The symbols in Table 10 indicate the positions for which the electrode is suitable for classification to System
A or System B.
Table 10 — Symbols for welding position
System A System B
a a
Symbol Welding positions Symbol Welding positions
1 PA, PB, PC, PD, PE, PF, PG
0 PA, PB
2 PA, PB, PC, PD, PE, PF
3 PA, PB
PA, PB, PC, PD, PE
4 PA 1
(PF or PG) or (PF and PG)
5 PA, PB, PG
a
In accordance with ISO 6947:2019:
PA = Flat position
PB = Horizontal vertical position
PC = Horizontal position
PD = Horizontal overhead position
PE = Overhead position
PF = Vertical up position
PG = Vertical down position
5.8 Symbol for hydrogen content of deposited metal
The symbols in Table 11 indicate the hydrogen content that shall be determined in accordance with the
method given in ISO 3690.
Table 11 — Symbol for hydrogen content of deposited metal
Hydrogen content
Symbol
ml/100 g deposited metal max.
H5 5
H10 10
H15 15
When the symbol for hydrogen content in accordance with Table 11 is included in the classification, the
manufacturer shall state in their literature the restrictions to be placed on the conditions of storage and on
current, arc voltage, electrode extension, polarity, and shielding gas to remain within the required limit.
See Annex D for additional information about diffusible hydrogen.
5.9 Symbol for condition of postweld heat treatment of all-weld metal
5.9.1 System A
Classification is based upon mechanical properties of the all-weld metal in the as-welded condition only. No
symbol is used to indicate this.

ISO/DIS 17632:2026(en)
5.9.2 System B
If the electrode has been classified in the as-welded condition, the symbol A shall be added to the
classification. If the electrode has been classified in the post-weld heat-treated condition, the condition of
post-weld heat treatment shall be as specified in 6.1.6.2 and the symbol P shall be added to the classification.
If the electrode has been classified in both conditions, the symbol AP shall be added to the classification.
6 Mechanical tests
6.1 Multi-run technique
6.1.1 System A
Tensile and impact tests and any required retests shall be carried out on weld metal prepared as described in
6.1.4.1 and Table 13, in the as-welded condition using an all-weld metal, test assembly type 1.3 in accordance
with ISO 15792-1:2020 using 1,2 mm for gas shielded electrodes or, if this size is not manufactured, the next
larger diameter manufactured, and 2,4 mm for self-shielded electrodes, or the largest size manufactured if
less than 2,4 mm.
6.1.2 System B
Tensile and impact tests shall be carried out on weld metal prepared as described in 6.1.4.2, Table 13 and
6.1.6.2 in the as-welded condition and/or in the post-weld heat-treated condition using an all-weld metal
test assembly type 1.3 in accordance withISO 15792-1:2020 using 1,2 mm for gas shielded electrodes or if
this size is not manufactured, the closest diameter manufactured and 2,4 mm for self-shielded electrodes or
the closest size manufactured.
6.1.3 Hydrogen removal
When the manufacturer specifies hydrogen removal treatment for tensile test specimen, it should be done in
accordance with ISO 15792-1:2020.
6.1.4 Preheating and interpass temperatures
6.1.4.1 System A
Preheating is not required. Welding can start from room temperature. The interpass temperature shall be
measured using temperature indicator crayons, surface thermometers, or thermocouples (see ISO 13916
[2]
).
The interpass temperature shall not exceed 250 °C. If after any pass this interpass temperature is exceeded,
the test assembly shall be cooled in air to a temperature below that limit.
6.1.4.2 System B
Preheating and interpass temperatures shall be selected for the appropriate weld metal type from Table 12.
The preheating and interpass temperature shall be measured using temperature indicator crayons, surface
[2]
thermometers, or thermocouples (see ISO 13916 ).
The interpass temperature shall not exceed the maximum temperature indicated in Table 12. If after any
pass this interpass temperature is exceeded, the test assembly shall be cooled in air to a temperature within
that range. If below interpass, reheat into interpass range.

ISO/DIS 17632:2026(en)
Table 12 — System B preheating and interpass temperatures
Composition designation Preheat temperature Interpass temperature
°C °C
No symbol, K Room temperature
150 ± 15
2M3, 3M2, N1, N2, N3, N5, N7, CC,
100 min.
NCC, NCC1, N1M2, N2M2, N
...