|
International
Standard
ISO 18276
Third edition
Welding consumables — Tubular
2024-07
cored electrodes for gas-shielded
and non-gas-shielded metal arc
welding of high strength steels —
Classification
Produits consommables pour le soudage — Fils-électrodes
fourrés pour le soudage à l'arc avec ou sans gaz de protection des
aciers à haute résistance — Classification
Reference number
© ISO 2024
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: [email protected]
Website: www.iso.org
Published in Switzerland
ii
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 in classifications .3
5 Symbols and requirements . 4
5.1 Symbol for the product or process .4
5.2 Symbol for tensile properties of all-weld metal .4
5.3 Symbol for impact properties of all-weld metal .5
5.4 Symbol for chemical composition of all-weld metal.6
5.5 Symbol for type of electrode core – Classification by yield strength and 47 J impact
energy – System A . .10
5.6 Symbol for usability characteristics of the electrodes – Classification by tensile
strength and 27 J impact energy – System B .10
5.7 Symbol for shielding gas .11
5.8 Symbol for welding position .11
5.9 Symbol for hydrogen content of deposited metal.11
5.10 Symbol for conditions of post-weld heat treatment . 12
5.10.1 Classification by yield strength and 47 J impact energy – System A . 12
5.10.2 Classification by tensile strength and 27 J impact energy – System B . 12
6 Rounding procedure .12
7 Mechanical tests .12
7.1 General . 12
7.2 Preheating and interpass temperatures . 12
7.3 Pass sequence . 13
7.4 Post-weld heat treatment (PWHT) condition .14
7.4.1 Classification by yield strength and 47 J impact energy – System A .14
7.4.2 Classification by tensile strength and 27 J impact energy – System B .14
8 Chemical analysis . . 14
9 Retesting . 14
10 Technical delivery conditions .15
11 Examples of designations .15
11.1 General . 15
11.2 Example 1 - Classification by yield strength and 47 J impact energy – System A . 15
11.3 Example 2 - Classification by tensile strength and 27 J impact energy – System B . 15
11.4 Example 3 – Classification by yield strength and 47 J impact energy - System A .16
11.5 Example 4 – Classification by tensile strength and 27 J impact energy – System B .17
Annex A (informative) Classification systems . 19
Annex B (informative) Description of composition designations for electrodes in the
classification system based upon tensile strength and average impact energy of 27 J –
System B .22
Annex C (informative) Description of types of electrode core in the classification system based
upon yield strength and average impact energy of 47 J – System A .23
iii
Annex D (informative) Descriptions of types of usability characteristics in the classification
system based upon tensile strength and average impact energy of 27 J – System B .24
Annex E (informative) Notes on hydrogen content .26
Bibliography .27
iv
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 18276:2017), which has been technically
revised.
The main changes are as follows:
— document has been reformatted in single column format. Some clauses and subclauses have been merged
or separated and some tables have been merged;
— dated normative references have been updated to the latest editions;
— Tables 3A and 3B have been revised and merged and is now Table 6;
— sub-clause 5.7 has been revised and is now 5.8;
— Clause 11 contains new designation examples.
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.
v
Introduction
This document proposes a classification system for tubular cored electrodes in terms of the tensile
properties, impact properties, chemical composition of the all-weld metal, type of electrode core, shielding
gas and welding position. The ratio of yield strength to tensile strength of the weld metal is generally higher
than that of the parent metal. Note that 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 requires matching tensile strength, therefore, selection of the consumable should be made by
reference to columns 3 and 7 of Table 3.
Note that the mechanical properties of all-weld metal test specimens used to classify tubular cored
electrodes differ from those obtained with production joints because of differences in welding procedure,
such as electrode size, width of weave, welding position and parent metal composition.
The classification in accordance with sy
...