SIST EN ISO 16828:2025
(Main)Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for detection and sizing of discontinuities (ISO 16828:2025)
Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for detection and sizing of discontinuities (ISO 16828:2025)
This document specifies the general principles for the application of the time-of-flight diffraction (TOFD) technique for both detection and sizing of discontinuities in low-alloyed carbon steel components.
This document also applies to other types of materials, provided the application of the TOFD technique is performed with necessary consideration of geometry, acoustical properties of the materials, and the test sensitivity.
Although this document is applicable, in general terms, for discontinuities in materials and applications covered by ISO 16810, it contains references to the application on welds. This approach has been chosen for reasons of clarity as to the probe positions and directions of scanning.
Unless otherwise specified in the referencing documents, the minimum requirements specified in this document apply.
Unless explicitly stated otherwise, this document is applicable to the following categories of test objects as specified in ISO 16811:
— category 1, without restrictions;
— categories 2 and 3, specified restrictions apply (see Clause 10);
— categories 4 and 5 require special procedures, which are also addressed (see Clause 10).
NOTE Techniques for the use of TOFD for weld testing are described in ISO 10863 and the related acceptance criteria are given in ISO 15626.
Zerstörungsfreie Prüfung - Ultraschallprüfung - Beugungslaufzeittechnik zum Auffinden und Ausmessen von Inhomogenitäten (ISO 16828:2025)
Dieses Dokument legt die allgemeinen Grundsätze zur Anwendung der Beugungslaufzeittechnik (TOFD, en: time-of-flight diffraction) für das Auffinden und für die Größenbestimmung von Inhomogenitäten in Bauteilen aus niedrig legierten Kohlenstoffstählen fest.
Dieses Dokument gilt auch für andere Werkstoffarten, wenn die TOFD-Technik mit der notwendigen Berücksichtigung der Geometrie, der akustischen Eigenschaften der Werkstoffe sowie der Prüfempfindlichkeit angewendet wird.
Obwohl dieses Dokument im Allgemeinen auf Inhomogenitäten in Werkstoffen anwendbar ist, die in ISO 16810 behandelt werden, sind auch Hinweise für die Prüfung von Schweißnähten enthalten. Dieser Weg wurde zur Verdeutlichung der Positionen des Prüfkopfes und der Abtastrichtungen gewählt.
Soweit in den Bezugsdokumenten nichts anderes festgelegt worden ist, gelten die in diesem Dokument festgelegten Mindestanforderungen.
Wenn es nicht ausdrücklich anders vorgegeben wird, ist dieses Dokument auf folgende in ISO 16811 festgelegte Geometrieklassen für Prüfgegenstände anwendbar:
- Geometrieklasse 1, ohne Einschränkungen;
- Geometrieklassen 2 und 3, erfordern Spezialverfahren, auf die auch hingewiesen wird (siehe Abschnitt 10);
- Geometrieklassen 4 und 5 erfordern Spezialverfahren, auf die auch hingewiesen wird (siehe Abschnitt 10).
ANMERKUNG Techniken für den Einsatz von TOFD für die Schweißnahtprüfung sind in ISO 10863 beschrieben, und die entsprechenden Zulässigkeitskriterien sind in ISO 15626 angegeben.
Essais non destructifs - Contrôle par ultrasons - Technique de diffraction du temps de vol pour la détection et le dimensionnement des discontinuités (ISO 16828:2025)
Le présent document spécifie les principes généraux pour l’application de la technique de diffraction du temps de vol (TOFD) pour la détection et le dimensionnement des discontinuités dans les composants en acier au carbone faiblement allié.
Le présent document s’applique également à d’autres types de matériaux, à condition que l’application de la technique TOFD tienne compte de la géométrie, des propriétés acoustiques des matériaux et de la sensibilité de contrôle.
Bien que le présent document soit applicable, en termes génériques, aux discontinuités des matériaux et applications couvertes par l’ISO 16810, il contient des références aux applications sur les soudures. Cette approche a été choisie pour des raisons de clarté en termes de position des traducteurs et de direction de balayage.
Sauf indications contraires dans les documents de référence, les exigences minimales spécifiées dans le présent document s’appliquent.
Sauf dispositions contraires explicites, le présent document s’applique aux catégories de pièces à contrôler suivantes, telles que définies dans l’ISO 16811:
— catégorie 1: sans restriction;
— catégories 2 et 3: les restrictions spécifiées s’appliquent (voir 10);
— catégories 4 et 5: exigent des modes opératoires particuliers, qui sont également traités (voir 10).
NOTE Les techniques d’utilisation de la TOFD pour les essais des assemblages soudés sont décrites dans l’ISO 10863 et les critères d’acceptation correspondants sont donnés dans l’ISO 15626.
Neporušitvene preiskave - Ultrazvočne preiskave - Metoda zvočne poti za odkrivanje in ocenjevanje velikosti nezveznosti (ISO 16828:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Neporušitvene preiskave - Ultrazvočne preiskave - Metoda zvočne poti za
odkrivanje in ocenjevanje velikosti nezveznosti (ISO 16828:2025)
Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for
detection and sizing of discontinuities (ISO 16828:2025)
Zerstörungsfreie Prüfung - Ultraschallprüfung - Beugungslaufzeittechnik zum Auffinden
und Ausmessen von Inhomogenitäten (ISO 16828:2025)
Essais non destructifs - Contrôle par ultrasons - Technique de diffraction du temps de vol
pour la détection et le dimensionnement des discontinuités (ISO 16828:2025)
Ta slovenski standard je istoveten z: EN ISO 16828:2025
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 16828
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN ISO 16828:2014
English Version
Non-destructive testing - Ultrasonic testing - Time-of-flight
diffraction technique for detection and sizing of
discontinuities (ISO 16828:2025)
Essais non destructifs - Contrôle par ultrasons - Zerstörungsfreie Prüfung - Ultraschallprüfung -
Technique de diffraction du temps de vol pour la Beugungslaufzeittechnik zum Auffinden und
détection et le dimensionnement des discontinuités Ausmessen von Inhomogenitäten (ISO 16828:2025)
(ISO 16828:2025)
This European Standard was approved by CEN on 11 July 2025.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16828:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 16828:2025) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing " in collaboration with Technical Committee CEN/TC 138 “Non-destructive testing”
the secretariat of which is held by AFNOR.
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 January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
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 16828:2014.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16828:2025 has been approved by CEN as EN ISO 16828:2025 without any modification.
International
Standard
ISO 16828
Second edition
Non-destructive testing —
2025-07
Ultrasonic testing — Time-of-flight
diffraction technique for detection
and sizing of discontinuities
Essais non destructifs — Contrôle par ultrasons — Technique
de diffraction du temps de vol pour la détection et le
dimensionnement des discontinuités
Reference number
ISO 16828:2025(en) © ISO 2025
ISO 16828:2025(en)
© ISO 2025
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: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16828:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units. 2
5 General . 3
5.1 Principle of the technique .3
5.2 Requirements for surface condition and couplant .5
5.3 Materials and process type .5
6 Qualification of test personnel . 5
7 Requirements for test equipment. 6
7.1 General .6
7.2 Instrument and display .6
7.3 Probes .8
7.4 Scanning .8
8 TOFD setup procedures . 9
8.1 General .9
8.2 Probe selection and probe separation .9
8.2.1 Probe selection.9
8.2.2 Probe separation .10
8.3 Time window setting .10
8.4 Sensitivity setting .10
8.5 Scan increment setting .10
8.6 Setting of scanning speed .11
8.7 Checking of system performance.11
9 Interpretation and analysis of data .11
9.1 Basic analysis of discontinuities .11
9.1.1 General .11
9.1.2 Characterization of discontinuities . 12
9.1.3 Estimation of discontinuity position . 12
9.1.4 Estimation of discontinuity length . 13
9.1.5 Estimation of discontinuity depth and height. 13
9.2 Detailed analysis of discontinuities .14
9.2.1 General .14
9.2.2 Additional scans .14
9.2.3 Additional algorithms . 15
10 Detection and sizing in complex geometries .16
11 Limitations of the TOFD technique .16
11.1 General .16
11.2 Accuracy and resolution .
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.