SIST EN ISO 16834:2025

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 16834:2012
Dodajni in pomožni materiali za varjenje - Žične elektrode, žice, palice in čisti vari
za obločno varjenje v zaščitnem plinu za visokotrdnostna jekla - Razvrstitev (ISO
16834:2025)
Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of high strength steels - Classification (ISO 16834:2025)
Schweißzusätze - Drahtelektroden, Drähte, Stäbe und Schweißgut zum
Schutzgasschweißen von hochfesten Stählen - Einteilung (ISO 16834:2025)
Produits consommables pour le soudage - Fils-électrodes, fils, baguettes et dépôts pour
le soudage à l'arc sous flux gazeux des aciers à haute résistance - Classification (ISO
16834:2025)
Ta slovenski standard je istoveten z: EN ISO 16834:2025
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16834
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2025
EUROPÄISCHE NORM
ICS 25.160.20 Supersedes EN ISO 16834:2012
English Version
Welding consumables - Wire electrodes, wires, rods and
deposits for gas shielded arc welding of high strength
steels - Classification (ISO 16834:2025)
Produits consommables pour le soudage - Fils- Schweißzusätze - Drahtelektroden, Drähte, Stäbe und
électrodes, fils, baguettes et dépôts pour le soudage à Schweißgut zum Schutzgasschweißen von hochfesten
l'arc sous flux gazeux des aciers à haute résistance - Stählen - Einteilung (ISO 16834:2025)
Classification (ISO 16834:2025)
This European Standard was approved by CEN on 23 June 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16834:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16834:2025) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2025, and conflicting national standards shall
be withdrawn at the latest by August 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 16834:2012.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16834:2025 has been approved by CEN as EN ISO 16834:2025 without any modification.

International
Standard
ISO 16834
Third edition
Welding consumables — Wire
2025-02
electrodes, wires, rods and deposits
for gas shielded arc welding of high
strength steels — Classification
Produits consommables pour le soudage — Fils-électrodes, fils,
baguettes et dépôts pour le soudage à l'arc sous flux gazeux des
aciers à haute résistance — Classification
Reference number
ISO 16834:2025(en) © ISO 2025
ISO 16834:2025(en)
© ISO 2025
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 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 the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16834:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
4.1 General .2
4.2 Classification systems .2
5 Symbols and requirements . 3
5.1 Symbols for the product/process .3
5.2 Symbols for strength and elongation properties of all-weld metal .3
5.2.1 Classification by yield strength and 47 J impact energy – System A .3
5.2.2 Classification by tensile strength and 27 J impact energy – System B .3
5.3 Symbol for impact properties of all-weld metal .3
5.3.1 Classification by yield strength and 47 J impact energy – System A .3
5.3.2 Classification by tensile strength and 27 J impact energy – System B .4
5.4 Symbol for shielding gas .4
5.5 Symbol for the chemical composition of wire electrodes, wires and rods .5
5.6 Symbol for condition of post-weld heat treatment .5
5.6.1 Classification by yield strength and 47 J impact energy – System A .5
5.6.2 Classification by tensile strength and 27 J impact energy – System B .5
6 Mechanical tests .10
7 Preheating and interpass temperatures .10
8 Welding conditions and pass sequence .10
8.1 General .10
8.2 Post-weld heat-treated condition .11
8.2.1 Classification by yield strength and 47 J impact energy – System A .11
8.2.2 Classification by tensile strength and 27 J impact energy – System B .11
9 Chemical analysis . .11
10 Rounding procedure .11
11 Retest.12
12 Technical delivery conditions .12
13 Examples of designation .12
13.1 General . 12
13.2 Example 1 – Classification by yield strength and 47 J impact energy – System A . 12
13.3 Example 2 - Classification by tensile strength and 27 J impact energy – System B . 13
13.4 Example 3 – Classification by yield strength and 47 J impact energy – System A . 13
13.5 Example 4 - Classification by tensile strength and 27 J impact energy – System B . 13
13.6 Example 5 - Classification by yield strength and 47 J impact energy – System A .14
13.7 Example 6 – Classification by tensile strength and 27 J impact energy – System B .14
Annex A (informative) Description of composition designations for electrodes in the
classification system based upon tensile strength and average impact energy of 27 J –
System B .16
Bibliography . 17

iii
ISO 16834:2025(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 ISO/TC 44, Welding and allied processes, Subcommittee
SC 3, Welding consumables, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 121, Welding and allied processes, in accordance with the Agreement on
technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 16834:2012), which has been technically
revised.
The main changes are as follows:
— document has been reformatted in single column showing System A and System B in tables and separate
clauses and subclauses, some which are new;
— In Clause 4, clarification that System A and System B are independent of each other and can produce
different results;
— Table 2 – addition of a new system A symbol 96 for strength and elongation properties of all weld metal;
— Table 3 - addition of new symbols 7 and 8 for impact properties of all-weld metal;
— Table 4 – some classifications have been revised and new classifications, N2M31, N2CM2, N3CM2, N4CM3,
N6C1M41 have been added, and footnotes have been revised;
— Tables 5, 7 and 8 – content has been added to the table and has been revised;
— Clause 13 has been updated to reflect changes.
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. Official interpretations of ISO/TC 44 documents, where they exist, are
available from this page: https://committee.iso.org/sites/tc44/home/interpretation.html.

iv
ISO 16834:2025(en)
Introduction
This document recognizes that there are two somewhat different approaches in the global market to
classifying a given wire electrode, wire, rod or deposit, and allows for either or both to be used to suit a
particular market need. Application of either type of classification designation (or of both where suitable)
identifies a product as classified in accordance with this document.
The classification in accordance with system A was originally based on EN 12534:1999 which has been
withdrawn and replaced by this document. The classification in accordance with system B is mainly based
upon standards used around the Pacific Rim. Future revisions will aim to merge the two systems into a
single classification system.
This document provides a classification for the designation of wire electrodes, wires, rods and deposits in
terms of their chemical composition and, where required, in terms of the yield strength, tensile strength
and elongation of the all-weld metal. The ratio of yield to tensile strength of weld metal is generally higher
than that of the parent metal. Users should note that matching weld metal yield strength to parent metal
yield strength does not necessarily ensure that the weld metal tensile strength matches that of the parent
material. Thus, where the application requires matching tensile strength, selection of the consumable should
be made by reference to Table 2 System A or System B, as appropriate.

v
International Standard ISO 16834:2025(en)
Welding consumables — Wire electrodes, wires, rods and
deposits for gas shielded arc welding of high strength steels
— Classification
1 Scope
This document specifies requirements for classification of wire electrodes, wires, rods and all-weld metal
deposits in the as-welded condition and in the post-weld heat-treated (PWHT) condition for gas shielded
metal arc welding and tungsten inert-gas welding of high-strength steels with a minimum yield strength
greater than 500 MPa, or a minimum tensile strength greater than 570 MPa. One wire electrode can be
tested and classified with different shielding gases.
This document is a combined specification providing for 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 wire electrodes,
wires, rods and deposits classified according to the system based upon the yield strength and the
average impact energy of 47 J of all-weld metal under this document.
b) Clauses, subclauses and tables which carry the suffix “System B” are applicable only to wire electrodes,
wires, rods and deposits classified according to the system based upon the tensile strength and the
average impact energy of 27 J of all-weld metal under this document.
c) Clauses, subclauses and tables which do not have either the suffix “System A” or “System B” are applicable
to all wire electrodes, wires, rods and deposits classified under this document.
Annex A gives information on the description of composition designations for electrodes in the classification
system based upon tensile strength and average impact energy of 27 J – System B.
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 13916, Welding — Measurement of preheating temperature, interpass temperature and preheat
maintenance temperature
ISO 14175:2008, 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 80000-1:2022, Quantities and units — Part 1: General

ISO 16834:2025(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 to indicate the tensile properties and the impact
properties of the all-weld metal obtained with a given wire electrode, wire or rod. The two designation
approaches include additional designators for some other classification requirements, but not all, as is clear
from the following clauses. In most cases, a given commercial product can be classified according to the
classification requirements in both systems. Then either or both classification designations can be used for
the product.
A wire electrode, wire or rod shall be classified in accordance with its chemical composition in Table 4. A
weld deposit shall be classified with additional symbols in accordance with the mechanical properties of its
all-weld metal, using a shielding gas from a specific group.
Since these are not equivalent, each system shall be used independently of the other, yet both may be used.
Differences in welding parameters and PWHT conditions can result in significant differences in the strength
and toughness of the weld metal.
4.2 Classification systems
Each classification system, A and B, is split into parts as given in Table 1.
Table 1 — Parts of the classification systems, A and B
Classification system
Part of
System A System B
classification
Classification by yield strength and 47 J Classification by tensile strength and 27 J
designation
impact energy impact energy
1 symbol indicating the product/process to be identified (see 5.1)
symbol indicating the strength and elongation of symbol indicating the strength and elongation
all-weld metal (see Table 2) of the all-weld metal in either the as-welded or
post-weld heat-treated condition (see Table 2
and 5.6.2)
symbol indicating the impact properties of all- symbol indicating the impact properties of all-
weld metal (see Table 3); weld metal in the same condition as specified for
the tensile strength (see Table 3).
The letter “U” after this designator indicates
that the deposit meets an average optional re-
quirement of 47 J at the designated Charpy test
temperature.
4 symbol indicating the shielding gas used (see 5.4)
5 symbol indicating the chemical composition of the wire electrode, wire or rod used (see Table 4);
symbol indicating the post-weld heat treatment —
in case this is applied (see 5.6.1).

ISO 16834:2025(en)
5 Symbols and requirements
5.1 Symbols for the product/process
The symbol for the wire electrode, wire or rod used in the arc welding process shall be the letter G (gas
shielded metal arc welding) and/or W (gas shielded arc welding with non-consumable tungsten electrode).
5.2 Symbols for strength and elongation properties of all-weld metal
5.2.1 Classification by yield strength and 47 J impact energy – System A
For classification by yield strength and 47 J impact energy , the symbol in Table 2 indicates yield strength,
tensile strength and elongation of the all-weld metal in the as-welded condition determined in accordance
with Clause 6 and Clause 7.
5.2.2 Classification by tensile strength and 27 J impact energy – System B
For classification by tensile strength and 27 J impact energy, the symbol in Table 2 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 Clause 6 and Clause 7.
Table 2 — Symbols for strength and elongation properties of all-weld metal
System A — System B —
Classification by yield strength and 47 J impact Classification by tensile strength and 27 J impact
energy energy
c
Symbol Minimum Tensile Minimum Symbol Tensile Minimum Minimum
a b
yield
yield strength strength b strength elongation
elongation
a
strength
MPa MPa % MPa MPa %
55 550 640 to 820 18 59X 590 to 790 490 16
62 620 700 to 890 18 62X 620 to 820 530 15
69 690 770 to 940 17 69X 690 to 890 600 14
79 790 880 to 1 080 16 76X 760 to 960 680 13
89 890 940 to 1 180 15 78X 780 to 980 680 13
96 960 980 to 1 220 13 83X 830 to 1 030 745 12
a
For yield strength, the lower yield strength, R , is used when yielding occurs, otherwise the 0,2 % proof strength,
eL
R , is used.
p0,2
b
Gauge length is equal to five times the test specimen diameter.
c
X is “A”, “P” or “AP”; see 5.6.2.
NOTE Post-weld heat treatment can alter the strength of the weld metal from that obtained in the as-welded
condition.
5.3 Symbol for impact properties of all-weld metal
5.3.1 Classification by yield strength and 47 J impact energy – System A
The symbols in Table 3 indicate the temperature at which an impact energy of 47 J is achieved under the
conditions given in Clause 6 and Clause 7. Three test specimens shall be tested. Only one individual value
may be lower than 47 J but not lower than 32 J.

ISO 16834:2025(en)
5.3.2 Classification by tensile strength and 27 J impact energy – System B
The symbols in Table 3 indicate the temperature at which an impact energy of 27 J is achieved in the as-
welded condition or in the post-weld heat-treated condition under the conditions given in Clause 6 and
Clause 7.
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 the specified 27 J level, one of the three may be lower but shall
not be less than 20 J. The average of the three remaining values shall be at least 27 J.
The addition of the optional symbol U, immediately after the symbol for condition of heat treatment, indicates
that the supplemental requirement of 47 J impact energy at the normal 27 J impact test temperature has also
been satisfied. For the 47 J impact requirement, the number of specimens tested and values obtained shall
meet the requirement of 5.3.1.
Table 3 — Symbol for impact properties of all-weld metal
Symbol Temperature for minimum average impact
a,b b
energy of 47 J or 27 J
°C
Z No requirements
a b
A or Y +20
0 0
2 −20
3 −30
4 −40
5 −50
6 −60
7 −70
8 −80
NOTE When an all-weld metal has been classified for a certain
temperature, it automatically covers any higher temperature.
a
See 5.3.1.
b
See 5.3.2.
5.4 Symbol for shielding gas
The symbols for shielding gases shall be in accordance with ISO 14175:2008, for example:
— The symbol I1 shall be used when the classification has been performed with shielding gas ISO 14175-I1,
100 % argon;
— The symbol M12, for mixed gases, shall be used when the classification has been performed with shielding
gas ISO 14175-M12, but without helium;
— The sy
...