Sung-Jin Song1  YE Jing1  Hak-Joon Kim1

 Suk-Chull Kang2  Sung-Sik Kang2  Kyungcho Kim2  Myung-Ho Song2 

(1 School of Mechanical Engineering, Sungkyunkwan University  300 Chunchun-dong, Jangan-gu 440-746 )

(2 Korea Institute of Nuclear Safety   Daejeon 305-338, Korea)

Received Oct. 27, 2009

Revised Jan. 12, 2010

Abstract Simulation of phased array beams in dovetail and austenitic welds is conducted to optimize the setup of phased array ultrasonic testing (PAUT). To simulate the beam in such material with complex geometry or with characteristic of anisotropy and inhomogeneity, firstly, linear phased multi-Gaussian beam (LPMGB) models are introduced and discussed. Then, in the case of dovetail, wedge is designed to maximize the stable amplitude of the beam along the steering path; in the case of austenitic wed, modified focal law are developed to solve the problem of beam screwing and defocusing due to the material properties. To verify the effectiveness of the modified focal law, beam fields are calculated using LPMGB model in austenitic welds.

PACS numbers: 43.35, 43.60