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BS EN ISO 10863:2020 pdf free

BS EN ISO 10863:2020 pdf free.Non-destructive testing of welds – Ultrasonic testing – Use of time-of-flight diffraction technique (TOFD).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5577. Non-destructive testing — Ultrasonic testing — Vocabulary
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel
ISO 16828, Non-destructive testing — Ultrasonic testing — Time-of-flight diffraction technique as a met hod for detection and sizing of discontinuities
ISO 17640. Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and assessment
ISO 22232-1’), Non-destructive testing — Characterization and verification of ultrasonic test equipment — Part 1: Instruments
The TOFD technique is an ultrasonic image-generating technique, which offers the capability of detection, location, and sizing. To a certain extent, characterization of discontinuities in the weld material as well as in the adjacent parent material is also possible.
Compared with purely reflection-based techniques, the TOFD technique, which is based on diffraction as well as reflection, is less sensitive to the orientation of the discontinuity. Discontinuities oriented perpendicular to the surface, and at intermediate angles of tilt, are detectable as well as discontinuities in the weld fusion faces.
In certain circunistances (e.g. thickness, weld preparation, scope of testing) more than one single TOFD setup is required.
A typical TOFD image is linear in time (vertical axis) and probe movement (horizontal axis). Because of the V-configuration of the ultrasound paths, the location of a possible discontinuity is then nonlinear. TOFD testing shall be carried out in a correct and consistent way, such that valid images are generated which can be evaluated correctly, e.g. coupling losses and data acquisition errors shall be avoided, see 122.
The interpretation of TOFD images requires skilled and experienced operators. Some typical TOFD images of discontinuities In fusion-welded joints are provided in Annex B.
There is a reduced capability for the detection oldiscontinuities close to or connected with the scanning surface or with the opposite surface. This shall be considered especially for crack-sensitive steels or at in-service inspections. In cases where full coverage of these zones is required, additional measures shall be taken, e.g. TOFD can be accompanied by other NDT methods or techniques.
Diffracted signals from weld discontinuities can have small amplitude responses. The grain scatter effect from coarse-grained material can hinder the detection and evaluation of such responses. This shall be taken into account whenever testing such material.BS EN ISO 10863 pdf download.

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