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

Taeyoung Han; Frank Schubert; Susanne Hillmann; Norbert Meyendorf

doi:10.1117/12.2086271

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27 March 2015 Phased array ultrasonic testing of dissimilar metal welds using geometric based referencing delay law technique

Taeyoung Han, Frank Schubert, Susanne Hillmann, Norbert Meyendorf

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Proceedings Volume 9439, Smart Materials and Nondestructive Evaluation for Energy Systems 2015; 943904 (2015) https://doi.org/10.1117/12.2086271
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

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 significantly increased signal-to-noise ratio (SNR).

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Taeyoung Han, Frank Schubert, Susanne Hillmann, and Norbert Meyendorf "Phased array ultrasonic testing of dissimilar metal welds using geometric based referencing delay law technique", Proc. SPIE 9439, Smart Materials and Nondestructive Evaluation for Energy Systems 2015, 943904 (27 March 2015); https://doi.org/10.1117/12.2086271

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