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Phased array ultrasonic testing of dissimilar metal welds using geometric based referencing delay law technique

: Han, Tae-Young; Schubert, Frank; Hillmann, Susanne; Meyendorf, Norbert


Meyendorf, N.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Smart Materials and Nondestructive Evaluation for Energy Systems 2015 : 9-10 March 2015, San Diego, California
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9439)
ISBN: 978-1-62841-542-1
Paper 943904, 11 S.
Conference "Smart Materials and Nondestructive Evaluation for Energy Systems" <2015, San Diego/Calif.>
Fraunhofer IKTS ()

Phased array ultrasonic testing (PAUT) techniques are widely used for the non-destructive testing (NDT) of austenitic welds to find defects like cracks. However, the propagation of ultrasound waves through the austenitic material is intricate due to its inhomogeneous and anisotropic nature. Such a characteristic leads beam path distorted which causes the signal to be misinterpreted. By employing a reference block which is cutout from the mockup of which the structure is a dissimilar metal weld (DMW), a new method of PAUT named as Referencing Delay Law Technique (RDLT) is introduced. With the RDLT, full matrix capture (FMC) was used for data acquisition. To reconstruct the images, total focusing method (TFM) was used. After the focal laws were calculated, PAUT was then performed. As a result, the flaws are more precisely positioned with significantly increased signal-to-noise ratio (SNR).