BS EN ISO 17640:2018 Non-destructive testing of welds.

BS EN ISO 17640:2018

Non-destructive testing of welds. Ultrasonic testing. Techniques, testing levels, and assessment

Status : Current   Published : January 2019



BS EN ISO 17640:2018 also available with tracked-changes. To learn more and buy, click HERE. 

What is this standard about?

This international standard specifies techniques for the manual ultrasonic testing of fusion-welded joints in metallic materials thicker than or equal to 8mm which exhibit low ultrasonic attenuation.

The standard’s guidelines detail specific testing techniques for metals that show weakened ultrasonic levels at temperatures of up to 60⁰C. It’s mainly designed for full penetration weld joints where both the welded and parent material are ferritic. It specifies ultrasonic values based on steels with an ultrasonic sound velocity of (5 920±50) m/s for longitudinal waves and (3 255±30) m/s for transverse waves.

Who is this standard for?

It will be used in the following industries:

  • Oil and gas
  • Power
  • Aerospace
  • Engineering and fabrication
  • Automotive
  • Rail
  • Shipbuilding
  • Defence
  • Off highway
  • Equipment, consumables and materials
  • Quality assurance

It will also be useful to universities.

Why should you use this standard?

It specifies four testing levels, each corresponding to a different probability of detection of imperfections. Guidance on the selection of testing levels A, B and C is given in Annex A.

The requirements of testing level D, which is intended for special applications, are in accordance with general requirements, although test level D can only be used when defined by specification. This includes tests of metals other than ferritic steel, tests on partial penetration welds, tests with automated equipment and tests at object temperatures outside the 0⁰C to 60⁰C range.

This document can be used for the assessment of discontinuities, for acceptance purposes, by either of the following techniques:

a)      Evaluation based primarily on length and echo amplitude of the discontinuity 

b)     Evaluation based on characterization and sizing of the discontinuity by probe movement techniques 

What’s changed since the last update?

This fourth edition of the standard cancels and replaces the 2017 version. The main change is that Figure A.4 a) and b) giving examples of probe positions for a structural L-joint has been corrected, meaning the standard can now be cited in the Official Journal of the EU (OJEU).

Standard NumberBS EN ISO 17640:2018
TitleNon-destructive testing of welds. Ultrasonic testing. Techniques, testing levels, and assessment
Publication Date23 January 2019
Normative References(Required to achieve compliance to this standard)ISO 5577, ISO 11666, ISO 16826, ISO 16810, ISO 23279, EN 12668 (all parts), ISO 16811, ISO 9712, ISO 17635
Informative References(Provided for Information)ISO 5817
ReplacesBS EN ISO 17640:2017
International RelationshipsEN ISO 17640:2018,ISO 17640:2018
Draft Superseded By18/30376824DC
DescriptorsSensitivity, Grades (quality), Examination (quality assurance), Reflectance factor, Welding, Fusion welding, Corner joints, Surface texture, Testing conditions, Acceptance inspection, Defects, Welded joints, Non-destructive testing, Size measurement, Attenuation, Butt joints, Ultrasonic testing, T-joints, Scanners, Probes, Flaws, Metals
Title in FrenchEssais non destructifs des assemblages soudés. Contrôle par ultrasons. Techniques, niveaux d'essai et évaluation
ISBN978 0 539 00771 8
File Size1.978 MB

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