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Long Range Ultrasonic Guided Wave Techniques for Inspection of Pipes  

Park, Ik-Keun (Dept. of Mechanical Engineering, Seoul National University)
Kim, Yong-Kwon (Graduate School of Energy and Environment, Seoul National University)
Kim, Hyun-Mook (Graduate School, Hanyang University)
Song, Won-Joon (Research Institute of Industrial Science and Technology)
Cho, Yong-Sang (Korea Electric Prower Research Institute)
Ahn, Yeon-Shik (Korea Electric Prower Research Institute)
Publication Information
Journal of Welding and Joining / v.23, no.5, 2005 , pp. 43-48 More about this Journal
Abstract
Conventional non-destructive techniques for inspection of the weld in pipelines require significant test time and high cost. Ultrasonic guided waves have been widely studied and successfully applied to various non-destructive tests with advantage of the long-range inspection. In this paper, a study on the application of ultrasonic guided waves to the long-range inspection of the pipeline is presented using a long-range guided wave inspection system, Wavemaker SE16, GUL. The characteristics and setup of the long-range guided wave inspection system and experimental results in pipes of with various diameter are introduced. The experimental results in mock-up pipes with cluster type detects show that the minimum detectable wall thickness reduction with this guided wave system is $2\~3\%$ in the pipe cross section area. And the wall thickness reduction of $5\%$ in cross section area can be detected when actual detection level is used. Therefore, the applicability of the guided wave systeme to long-range inspection of wall thickness reduction in pipes is verified.
Keywords
Ultrasonic guided wave; Torsional mode; Dispersion Curves; Wave structure;
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