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

 
: Han, T.; Kim, K.; Barth, M.; Brusinsky, A.; Schubert, F.; Lee, S.; Seo, J.; Meyendorf, N.

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Volltext (PDF; )

Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren -IZFP-, Institutsteil Dresden:
7th International Workshop NDT in Progress. Online Proceedings : NDT of Lightweight Materials. Dresden, Germany, November 7 - 8, 2013
Online im WWW, 2013
http://www.ndt.net/search/docs.php3?MainSource=168
2 S.
International Workshop "NDT in Progress" <7, 2013, Dresden>
Englisch
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Abstract
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 significantlyincreased signal-to-noise ratio (SNR).

: http://publica.fraunhofer.de/dokumente/N-441793.html