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Ultrasonic imaging and sizing of stress corrosion cracks in welded austenitic components using the synthetic aperture focusing technique

Caratterizzazione per immagini con metodo ultrasonoro e dimensionamento di cricche da tensocorrosione in componenti saldati in acciaio inossidabile mediante Synthetic Aperture Focusing Technique (SAFT)
: Rieder, H.; Dillhofer, A.; Spies, M.; Dugan, S.

Rivista italiana della saldatura 68 (2016), No.3, pp.349-358
ISSN: 0035-6794
English, Italian
Journal Article
Fraunhofer ITWM ()

The detection and evaluation of intergranular stress corrosion cracks (IGSCC) using ultrasonic testing is aggravated due to the crack properties. Their complex branched geometry dramatically influences the defect signals, thus amplitude- based sizing techniques may fail. In this contribution we report on examinations on specimens with artificially grown IGSCCs, where we have applied conventional techniques using angle beam inspection. The defect sizing has been performed on the basis of reconstructions using the Synthetic Aperture Focusing Technique (SAFT), where we have evaluated the mirror angle and crack tip signals. Results of dye penetrant testing and radiography are shown for comparison.