EN ISO 15626:2018

SLOVENSKI STANDARD
01-oktober-2018
1DGRPHãþD
SIST EN ISO 15626:2013
Neporušitveno preskušanje zvarnih spojev - Tehnika TOFD - Stopnje
sprejemljivosti (ISO 15626:2018)
Non-destructive testing of welds - Time-of-flight diffraction technique (TOFD) -
Acceptance levels (ISO 15626:2018)
Zerstörungsfreie Prüfung von Schweißverbindungen - Beugungslaufzeittechnik (TOFD) -
Zulässigkeitsgrenzen (ISO 15626:2018)
Essais non destructifs des assemblages soudés - Technique de diffraction des temps de
vol (méthode TOFD) - Niveaux d'acceptation (ISO 15626:2018)
Ta slovenski standard je istoveten z: EN ISO 15626:2018
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 15626
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2018
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN ISO 15626:2013
English Version
Non-destructive testing of welds - Time-of-flight
diffraction technique (TOFD) - Acceptance levels (ISO
15626:2018)
Essais non destructifs des assemblages soudés - Zerstörungsfreie Prüfung von Schweißverbindungen -
Technique de diffraction des temps de vol (méthode Beugungslaufzeittechnik (TOFD) -
TOFD) - Niveaux d'acceptation (ISO 15626:2018) Zulässigkeitsgrenzen (ISO 15626:2018)
This European Standard was approved by CEN on 14 July 2018.

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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15626:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15626:2018) 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 February 2019, and conflicting national standards
shall be withdrawn at the latest by February 2019.
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 15626:2013.
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 15626:2018 has been approved by CEN as EN ISO 15626:2018 without any modification.

INTERNATIONAL ISO
STANDARD 15626
Second edition
2018-07
Non-destructive testing of welds —
Time-of-flight diffraction technique
(TOFD) — Acceptance levels
Essais non destructifs des assemblages soudés — Technique
de diffraction des temps de vol (méthode TOFD) — Niveaux
d'acceptation
Reference number
ISO 15626:2018(E)
©
ISO 2018
ISO 15626:2018(E)
© ISO 2018
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
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 15626:2018(E)
Contents Page
.Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Relation between quality levels and acceptance levels . 1
6 Definition and determination of length and height . 2
6.1 General . 2
6.2 Determination of length . 2
6.2.1 General. 2
6.2.2 Length sizing of elongated straight indications . 2
6.2.3 Length sizing of elongated curved indications . 3
6.3 Determination of height . 4
6.3.1 General. 4
6.3.2 Surface-breaking discontinuities . 5
6.3.3 Embedded discontinuities . 6
7 Acceptance levels . 6
7.1 General . 6
7.2 Indications from single discontinuities . 7
7.2.1 General. 7
7.2.2 Acceptance level 1 . 7
7.2.3 Acceptance level 2 . 8
7.2.4 Acceptance level 3 . 8
7.3 Total length of indications . 8
7.4 Grouping of indications . 9
7.5 Point-like indications . . 9
Bibliography .11
ISO 15626:2018(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.o rg/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 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 5, Testing and inspection of welds.
Any feedback, question or request for official interpretation related to 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/members. html. Official interpretations, where they
exist, are available from this page: https:/ /committee. iso. org/sites/tc44/home/interpretation. html.
This second edition cancels and replaces the first edition (ISO 15626:2011), which has been technically
revised. The main changes compared to the previous edition are as follows:
— in 6.3.1, method 4 has been described;
— for all figures, the keys have been completed.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 15626:2018(E)
Non-destructive testing of welds — Time-of-flight
diffraction technique (TOFD) — Acceptance levels
1 Scope
This document specifies acceptance levels for the time-of-flight diffraction technique (TOFD) of full
penetration welds in ferritic steels from 6 mm up to 300 mm thickness which correspond to the quality
levels of ISO 5817.
These acceptance levels are applicable to indications classified in accordance with ISO 10863.
2 Normative references
The following documents a
...