Laser-Generation Based Imaging of Ultrasonic Wave Propagation on Welded Steel Plates and Its Application to Defect Detection

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  • Yashiro Shigeki
    Faculty of Engineering, Shizuoka University
  • Toyama Nobuyuki
    Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST)
  • Takatsubo Junji
    Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST)
  • Shiraishi Tetsuro
    Graduate School of Science and Engineering, Ehime University

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This study investigated nondestructive testing of welded steel plates by imaging ultrasonic wave propagation based on laser generation. The specimens were scanned by a pulsed laser, and the signals were received by a fixed piezoelectric transducer. A moving diagram of wave propagation from the fixed point was obtained directly from the collected signals. Wave scattering due to a weld defect (e.g., toe crack or root crack) was successfully imaged on weld specimens, and was easily recognized by visual observation in the measured moving diagrams. These experiments demonstrated the ability of the imaging technique to inspect a large area in a short time and to reliably detect a defect. Furthermore, the position-time-amplitude maps (B-scope images) were reconstructed from the moving diagram along some lines perpendicular to the defect, and the location and the size of a root crack were evaluated based on the B-scope images.

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (11), 2069-2075, 2010

    公益社団法人 日本金属学会

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