EN ISO 636:2015

SLOVENSKI STANDARD
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SIST EN ISO 636:2008
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Welding consumables - Rods, wires and deposits for tungsten inert gas welding of non-
alloy and fine-grain steels - Classification (ISO 636:2015)
Schweißzusätze - Stäbe, Drähte und Schweißgut zum Wolfram-Inertgasschweißen von
unlegierten Stählen und Feinkornstählen - Einteilung (ISO 636:2015)
Produits consommables pour le soudage - Baguettes et fils pour dépôts par soudage
TIG des aciers non alliés et des aciers à grains fins - Classification (ISO 636:2015)
Ta slovenski standard je istoveten z: EN ISO 636:2015
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 636
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2015
EUROPÄISCHE NORM
ICS 25.160.20 Supersedes EN ISO 636:2008
English Version
Welding consumables - Rods, wires and deposits for
tungsten inert gas welding of non-alloy and fine-grain
steels - Classification (ISO 636:2015)
Produits consommables pour le soudage - Baguettes et Schweißzusätze - Stäbe, Drähte und Schweißgut zum
fils pour dépôts par soudage TIG des aciers non alliés Wolfram-Inertgasschweißen von unlegierten Stählen
et des aciers à grains fins - Classification (ISO und Feinkornstählen - Einteilung (ISO 636:2015)
636:2015)
This European Standard was approved by CEN on 15 August 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 636:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 636:2015) 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 DIN.
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 June 2016, and conflicting national standards shall be
withdrawn at the latest by June 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 636:2008.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 636:2015 has been approved by CEN as EN ISO 636:2015 without any modification.

INTERNATIONAL ISO
STANDARD 636
Fourth edition
2015-11-15
Welding consumables — Rods, wires
and deposits for tungsten inert gas
welding of non-alloy and fine-grain
steels — Classification
Produits consommables pour le soudage — Baguettes et fils pour
dépôts par soudage TIG des aciers non alliés et des aciers à grains fins
— Classification
Reference number
ISO 636:2015(E)
©
ISO 2015
ISO 636:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 636:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Classification . 1
4 Symbols and requirements . 2
4.1 Symbol for the product/process . 2
4.2 Symbol for strength and elongation of all-weld metal . 3
4.3 Symbol for impact properties of all-weld metal . 4
4.4 Symbol for the chemical composition of rods or wires . 4
5 Mechanical tests . 9
5.1 Preheating and interpass temperatures . 9
5.2 Welding conditions and pass sequence .10
5.3 PWHT condition .10
6 Chemical analysis .10
7 Rounding procedure .11
8 Retests .11
9 Technical delivery conditions .11
10 Designation .11
ISO 636:2015(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 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.
This fourth edition cancels and replaces the third edition (ISO 636:2004), which has been
technically revised.
Requests for official interpretations of any aspect of this International Standard 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.
iv © ISO 2015 – All rights reserved

ISO 636:2015(E)
Introduction
This International Standard provides a classification for the designation of rods and wires 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 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 material. Where
the application requires matching tensile strengths, selection of consumables is made by reference to
column 3 of Table 1A or Table 1B.
Of note is that the mechanical properties of all-weld metal test specimens used to classify the rods and
wires vary from those obtained in production joints because of differences in welding procedure such
as diameter, width of weave, welding position, and material composition.
The classification according to system A is mainly based on EN 1668:1997. The classification according
to system B is mainly based upon standards used around the Pacific Rim.
INTERNATIONAL STANDARD ISO 636:2015(E)
Welding consumables — Rods, wires and deposits for
tungsten inert gas welding of non-alloy and fine-grain
steels — Classification
1 Scope
This International Standard specifies requirements for classification of rods and wires in the as-
welded condition and in the post-weld heat-treated condition for tungsten inert gas welding of non-
alloy and fine-grain steels with a minimum yield strength of up to 500 MPa or a minimum tensile
strength of up to 570 MPa.
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.
a) Paragraphs and tables which carry the suffix letter “A” are applicable only to rods and wires
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.
b) Paragraphs and tables which carry the suffix letter “B” are applicable only to rods and wires
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.
c) Paragraphs and tables which have neither the suffix letter “A” nor the suffix letter “B” are applicable
to all rods and wires classified in accordance with this International Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 544, Welding consumables — Technical delivery conditions for filler materials and fluxes — Type of
product, dimensions, tolerances and markings
ISO 13916, Welding — Guidance on the measurement of preheating temperature, interpass temperature
and preheat maintenance temperature
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 15792-1:2000, Welding consumables — Test methods — Part 1: Test methods for all-weld metal test
specimens in steel, nickel and nickel alloys. Amended by ISO 15792-1:2000/Amd 1:2011
ISO 80000-1:2009, Quantities and units — Part 1: General. Corrected by ISO 80000-1:2009/Cor 1:2011
3 Classification
Classification designations are based upon two approaches to indicate the tensile properties and the
impact properties of the all-weld metal obtained with rods or wires. The two designation approaches
include additional designators for some other classification requirements, but not all as will be
clear from the following sections. In most cases, a given commercial product can be classified to the
ISO 636:2015(E)
classification requirements in both systems. Then, either or both classification designations can be
used for the product.
Rods or wires shall be classified according to their chemical composition in accordance with
Table 3A or Table 3B.
3A  Classification by yield strength and 47 J  3B  Classification according to alloy type
impact energy
The classification is divided into four parts. The classification is divided into four parts.
1)  The first part gives a symbol indicating the 1)  The first part gives a symbol indicating the
product/process to be identified.    product/process to be identified.
2)  The second part gives a symbol indicating 2)  The second part gives a symbol indicating
the strength and elongation of the all-weld     the strength and elongation of the all-weld
metal (see Table 1A).    metal in either the as-welded or post-weld
heat-treated condition (see Table 1B).
3)  The third part gives a symbol indicating the
impact properties of all-weld metal (see 3)  The third part gives a symbol indicating
Table 2).    the impact properties of all-weld metal in
the same condition as specified for the
4)  The fourth part gives a symbol indicating
tensile strength (see Table 2). The letter
the chemical composition of the rods or
“U” after this designator indicates that the
wires used (see Table 3A).
deposit meets an average optional
requirement of 47 J at the designated
Charpy test temperature.
4)  The fourth part gives a symbol indicating
the chemical composition of the rods or
wires used (see Table 3B).
4 Symbols and requirements
4.1 Symbol for the product/process
The symbol of weld deposit by the tungsten inert gas welding process shall be the letter “W” placed at
the beginning of the designation.
The symbol of rods or wires for the tungsten inert gas welding shall be the letter “W” placed at the
beginning of the rod or wire designation.
2 © ISO 2015 – All rights reserved

ISO 636:2015(E)
4.2 Symbol for strength and elongation of all-weld metal
4.2A  Classification by yield strength and 4.2B  Classification by tensile strength and
47 J impact energy 27 J impact energy
The symbol in Table 1A indicates yield The symbol in Table 1B indicates yield
strength, tensile strength, and elongation of strength, tensile strength, and elongation of the
the all-weld metal in the as-welded condition all-weld metal in the as-welded condition or in
determined in accordance with Clause 5. the post-weld heat-treated condition
determined in accordance with Clause 5.
Table 1A — Symbol for strength and elonga- Table 1B — Symbol for strength and elongation
ti
...