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Normas DIN – AENOR
DIN EN ISO 22825:2018-02

DIN EN ISO 22825:2018-02

Non-destructive testing of welds - Ultrasonic testing - Testing of welds in austenitic steels and nickel-based alloys (ISO 22825:2017); German version EN ISO 22825:2017

Essais non destructif des assemblages soudés - Contrôle par ultrasons - Contrôle des soudures en aciers austénitiques et en alliages à base nickel (ISO 22825:2017); Version allemande EN ISO 22825:2017

Zerstörungsfreie Prüfung von Schweißverbindungen - Ultraschallprüfung - Prüfung von Schweißverbindungen in austenitischen Stählen und Nickellegierungen (ISO 22825:2017); Deutsche Fassung EN ISO 22825:2017

Fecha:
2018-02 /Active
Equivalencias internacionales:

EN ISO 22825 (2017-11)

ISO 22825 (2017-09)

Relación con otras normas DIN:
Resumen:
Welds in austenitic steel components and dissimilar metal welds are widely regarded as very difficult to test by ultrasound. The problems are mainly associated with unfavourable structure and grain size, as well as with different material properties which result in inhomogeneous and anisotropic mechanical and acoustic properties that contrast with the relatively homogeneous and isotropic behaviour in low-alloy steel welds. Austenitic weld metal and other coarse-grained, anisotropic materials can significantly affect the propagation of ultrasound. In addition, beam distortion, unexpected reflections and wave mode conversions on the fusion line and/or columnar grains can occur. Therefore it can be difficult and sometimes impossible for ultrasonic waves to penetrate the weld metal. Ultrasonic testing of these metals may require techniques that differ from conventional testing techniques. These special techniques often include the use of dual-element probes designed for refracted compression (longitudinal) waves or creeping waves rather than for conventional shear (transverse) waves. In addition, it is necessary to produce representative reference blocks with welds in order to develop a testing procedure, set a preliminary sensitivity level, assess the procedure and demonstrate effectiveness before a definitive procedure is written. Material, weld preparation and welding procedure, as well as the geometry and surface condition of reference blocks are the same as for the component being tested.
Keywords:
Austenitic steels, Definitions, Finishes, Information, Materials, Materials testing, Nickel alloys, Non-destructive testing, Sensitivity, Steels, Test specifications, Testing, Ultrasonic testing, Ultrasonics, Welded joints, Welding, Welding engineering
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