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INTERNATIONAL
STANDARD
ISO
23279
Third edition
2017-08
Non-destructive testing of welds —
Ultrasonic testing — Characterization
of discontinuities in welds
Essais non destructifs des assemblages soudés — Contrôle par
ultrasons — Caractérisation des discontinuités dans les assemblages
soudés
Reference number
ISO 23279:2017(E)
© ISO 2017
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ISO 23279:2017(E)

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© ISO 2017, Published in Switzerland
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ISO 23279:2017(E)

Contents
Page
Foreword......................................................................................................................................................................................................................................... iv
1 Scope.................................................................................................................................................................................................................................. 1
2
3
Normative references....................................................................................................................................................................................... 1
Terms and definitions...................................................................................................................................................................................... 1
4 Principle......................................................................................................................................................................................................................... 1
5 Criteria............................................................................................................................................................................................................................. 2
5.1 General............................................................................................................................................................................................................ 2
5.2
Echo amplitude criteria (stages 1 and 2).......................................................................................................................... 3
5.2.1 Low amplitudes (stage 1).......................................................................................................................................... 3
5.2.2 High amplitudes (stage 2)......................................................................................................................................... 3
5.3
Directional reflectivity criteria (stage 3)........................................................................................................................... 3
5.3.1 Applicability based on length................................................................................................................................ 3
5.3.2 Application conditions................................................................................................................................................. 3
5.3.3 Criteria....................................................................................................................................................................................... 3
5.4
Echo static pattern criteria (stage 4).................................................................................................................................... 4
5.5
Transverse echo dynamic pattern criteria (stage 5)............................................................................................... 4
5.6
Complementary testing.................................................................................................................................................................... 4
Annex A (normative) Classification of indications from internal discontinuities in welds —
Flowchart procedure......................................................................................................................................................................................... 5
Annex B (informative) Directional reflectivity........................................................................................................................................... 8
Annex C (informative) Basic echo dynamic patterns of reflectors......................................................................................10
© ISO 2017 – All rights reserved

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ISO 23279:2017(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 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 the following
URL: www​.iso​.org/​iso/​foreword​.html.
This document was prepared by Technical Committee ISO/TC  44, Welding and allied processes,
Subcommittee SC 5, Testing and inspection of welds.
This third edition cancels and replaces the second edition (ISO 23279:2010), which has been technically
revised.