20/30392796 DC - BS ISO 23864. Non-destructive testing of welds. Ultrasonic testing. Use of (semi-) automated full matrix capture / total focusing technique (FMC/TFM)

20/30392796 DC

BS ISO 23864. Non-destructive testing of welds. Ultrasonic testing. Use of (semi-) automated full matrix capture / total focusing technique (FMC/TFM)

Status : Current, Draft for public comment   Published : January 2020

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This document specifies the application of the FMC/TFM technique for the ultrasonic testing of fusion- welded joints in metallic materials of minimum thickness 3,2 mm. This document is applicable only to components with welds fabricated using metals which have isotropic (constant properties in all directions) and homogeneous conditions. This includes welds in low carbon alloy steels and common aerospace grade aluminium and titanium alloys, provided they are homogeneous and isotropic.

This document applies to full penetration welded joints of simple geometry in plates, pipes and vessels. Coarse-grained metals and austenitic welds may be tested when testing level “D” is applied and the provisions in clause 17 of this document have been taken into account.

Where material-dependent ultrasonic parameters are specified in this document, they are based on steels having an ultrasonic sound velocity of (5920 ± 50) m/s for longitudinal waves, and (3255 ± 30) m/s for transverse waves. It is necessary to take this into account when testing materials with different velocities.

This document gives guidance on the specific capabilities and limitations of the FMC/TFM technique for the detection, locating, sizing and characterization of discontinuities in fusion-welded joints. The FMC/TFM technique can be used as a stand-alone approach or in combination with other non-destructive testing (NDT) methods for manufacturing, in-service and post-repair tests.

This document specifies four testing levels, each corresponding to a different probability of detection of imperfections.

This document permits assessment of indications for acceptance purposes based on either amplitude (equivalent reflector size) and length or height and length.

This document does not include acceptance levels for discontinuities.

Two typical scanning techniques for welded joints will be referred to in this document. These are:

  1. Side scanning, where the probe(s) is positioned on the surface adjacent to the weld cap on wedges. Side scanning can be performed from one side or both sides of the weld.

  2. Top scanning where the probe is positioned on top of the weld cap with a flexible wedge or using immersion, or in contact after removing the weld cap. Top scanning where the probe is positioned on top of weld cap with a flexible or conformable wedge or using immersion, or in contact after removing the weld cap.

“Semi-automated testing” encompasses a controlled movement of one or more probes on the surface of the test object along a fixture (guidance strip, ruler, etc.), whereby the probe position is unambiguously measured with a position sensor. The scan is performed manually. “Fully automated testing“, includes mechanized propulsion in addition.




Standard Number20/30392796 DC
TitleBS ISO 23864. Non-destructive testing of welds. Ultrasonic testing. Use of (semi-) automated full matrix capture / total focusing technique (FMC/TFM)
StatusCurrent, Draft for public comment
Publication Date09 January 2020
Normative References(Required to achieve compliance to this standard)ISO 18563-1, ISO 17635, ISO 5577, EN 16018, ISO 18563-2, ISO 23865, ISO 5817, ISO 9712, ISO 19285, ISO/TS 16829:2017, ISO 22825:2017
Informative References(Provided for Information)ISO 17640, ISO 23243, ISO 13588, ISO 18563-3, ISO 19675, ISO 10863:2011, ISO/TS 16829:2017
International RelationshipsISO/DIS 23864
Draft Expiry Date03 March 2020
DescriptorsNon-destructive testing, Welds, Ultrasonic engineering, Ultrasonic frequencies, Ultrasonics, Probes
ICS25.160.40
Title in FrenchEssais non destructifs des assemblages soudés -- Contrôle par ultrasons -- Utilisation de la technique d’acquisition (semi-) automatisée de la matrice intégrale/focalisation en tout point (FMC/FTP)
CommitteeWEE/-/1
PublisherBSI
FormatA4
DeliveryYes
Pages38
File Size2.963 MB
NotesWarning: this draft is not current beyond its expiry date for comments.
Price£20.00


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