EN ISO 23279:2017

SLOVENSKI STANDARD
01-marec-2018
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SIST EN ISO 23279:2011
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Non-destructive testing of welds - Ultrasonic testing - Characterization of discontinuities
in welds (ISO 23279:2017)
Zerstörungsfreie Prüfung von Schweißverbindungen - Ultraschallprüfung -
Charakterisierung von Inhomogenitäten in Schweißnähten (ISO 23279:2017)
Essais non destructifs des assemblages soudés - Contrôle par ultrasons -
Caractérisation des discontinuités dans les assemblages soudés (ISO 23279:2017)
Ta slovenski standard je istoveten z: EN ISO 23279:2017
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23279
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN ISO 23279:2010
English Version
Non-destructive testing of welds - Ultrasonic testing -
Characterization of discontinuities in welds (ISO
23279:2017)
Essais non destructifs des assemblages soudés - Zerstörungsfreie Prüfung von Schweißverbindungen -
Contrôle par ultrasons - Caractérisation des Ultraschallprüfung - Charakterisierung von
discontinuités dans les assemblages soudés (ISO Inhomogenitäten in Schweißnähten (ISO 23279:2017)
23279:2017)
This European Standard was approved by CEN on 4 June 2017.

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, Serbia, 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
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23279:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 23279:2017) 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 March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
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 23279:2010.
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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 23279:2017 has been approved by CEN as EN ISO 23279:2017 without any modification.

INTERNATIONAL ISO
STANDARD 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
ISO 23279:2017(E)
© ISO 2017, 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
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ii © ISO 2017 – All rights reserved

ISO 23279:2017(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 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 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
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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).
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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .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.
Requests for official interpretations of any aspect of this document should be directed to the Secretariat
of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be found at
www .iso .org.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 23279:2017(E)
Non-destructive testing of welds — Ultrasonic testing —
Characterization of discontinuities in welds
1 Scope
This document specifies how to characterize indications from discontinuities by classifying them as
originating from planar or non-planar embedded discontinuities.
This procedure is also suitable for indications from discontinuities that break the surface after removal
of the weld reinforcement.
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 11666, Non-destructive testing of welds — Ultrasonic testing — Acceptance levels
ISO 17640, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Principle
Classification of discontinuities as planar or non-planar is based on several parameters:
a) welding techniques;
b) geometrical position of the discontinuity;
c) maximum echo amplitude;
d) directional reflectivity;
e) echo static pattern (i.e. A-scan);
f) echo dynamic pattern (envelope).
The process of classification involves examining each of the parameters against all the others in order
to arrive at an accurate conclusion.
For guidance, Figure A.1 gives the classification of indications from internal weld discontinuities
suitable for general applications. Figure A.1 should be applied in conjunction with the two parameters
a) and b) listed above and not taken in isolation.
...