Article Periodicals » Materials Evaluation » Article
Development of Single-Channel and Phased Array Electromagnetic Acoustic Transducers for Austenitic Weld Testing

Austenitic welds are widely used in nuclear, petrochemical and process industries. The strong material anisotropy and coarse grain structure in the dendritic weld zone makes these welds very difficult to inspect with conventional techniques. It is well-known that the shear horizontal (SH) wave is well-suited for this inspection and that electromagnetic acoustic transducer (EMAT) is the best technique for generating this wave mode, but the lack of equipment has precluded its application in the field. This paper presents the development of one channel and phased array EMAT systems and results from tests conducted on samples provided by the Electric Power Research Institute (EPRI). The results show the potential of this new equipment for austenitic weld inspection, which opens up new possibilities for research and field use.

Dube, Noel, “Introduction to Phased Array Ultrasonic Technology Applications,” Quebec, Canada, R/DTech, 2004. Gao, Huidong, Syed Ali and Borja Lopez, “Efficient Detection of Delamination in Multilayered Structures Using Ultrasonic Guided Wave EMATs,” NDT&E International, 2010a. Gao, Huidong, Syed Ali and Borja Lopez, “Inspection of Austenitic Weld with EMATs,” Review of Progress in Quantitative Nondestructive Evaluation, 29B, 2010b, pp. 1175-1181. Hirao, M. and H. Ogi, EMATs for Science and Industry-Noncontacting Ultrasonic Measurements, Dordrecht, the Netherlands, Kluwer Academic Publishers, 2003. Hubschen, G., H.J. Salzburger, M. Kroning, Bernus L. von and Oellrich, K., Results and Experiences of ISI of Austenitic and Dissimilar Welds Using SHWaves and EMUS-Probes, Elsevier Science Publishers, 1993, Conference Transaction SMiRT-12, 1993, pp. 249-254. Huggell, J. and B.S. Gray, “The Ultrasonic Inspection of Austenitic Materials – State of the Art Report,” Warrington, England, Risley Nuclear Power Development Laboratories, 1985. Silk, M.G., “A Computer Model for Ultrasonic Propagation in Complex Orthotropic Structures,” Ultrasonics, 19, 1981, pp. 208-212. Thompson, R.B. “ Physical Principles of Measurements with EMAT Transducers,” Physical Acoustics, Vol. 19, 1990, pp. 157-199. von Bernus, Ludwig, Werner Rathgeb, Rudi Schmid, Friedrich Mohr and Michael Kroning, “Current In-service Inspection of Austenitic Stainless Steel and Dissimilar Metal Welds in Light Water Nuclear Power Plants,” Nuclear Engineering and Design, 151, 1994, pp. 539-550.
Usage Shares
Total Views
105 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage