National foreword

This British Standard is the UK implementation of ISO 23865:2021.

The UK participation in its preparation was entrusted to Technical Committee WEE/-/1, Briefing committee for welding.

A list of organizations represented on this committee can be obtained on request to its committee manager.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2021.

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).

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Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

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This document was prepared by the IIW, International Institute of Welding, Commission V, NDT and Quality Assurance of Welded Products.

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.

1 Scope

This document gives general provisions for applying ultrasonic testing with arrays using FMC/TFM techniques and related technologies. It is intended to promote the adoption of good practice either at the manufacturing stage or for in-service testing of existing installations or for repairs.

Some examples of applications considered in this document deal with characterization and sizing in damage assessment.

Materials considered are low-alloyed carbon steels and common aerospace grade aluminium and titanium alloys, provided they are homogeneous and isotropic, but some recommendations are given for other materials (e.g. austenitic ones).

This document does not include acceptance levels for discontinuities.

For the application of FMC/TFM to testing of welds, see ISO 23864.

2 Normative references

3 Terms and definitions

4 Principle of the technique

4.1 General

4.2 Comparison between FMC/TFM and PAUT

5 Requirements for surface condition and couplant

6 Information required prior to testing

6.1 General

6.2 Items to define prior to procedure development

7 Requirements for test personnel

8 Requirements for test equipment

8.1 General

8.2 Instrument

8.3 Probes

8.4 Scanning mechanisms

8.5 Sampling frequency

8.6 Data processing

8.7 Evaluation of TFM indications

9 Benefits of various imaging paths

10 Preparation for testing

10.1 General

10.2 System checking

10.3 Sensitivity correction

10.4 Sensitivity setting

10.5 Grid verification

10.6 Preparation of scanning surfaces

10.7 Couplant

11 Test procedure

12 Data storage

13 Interpretation and analysis of TFM images

13.1 General

13.2 Assessing the quality of TFM images

13.3 Identification of relevant TFM indications

14 Test report

15 Typical influences and compensation mechanisms

Bibliography

BS ISO 23865:2021

Non-destructive testing. Ultrasonic testing. General use of full matrix capture/total focusing technique (FMC/TFM) and related technologies

Current

Published:

31 Jan 2021