| 摘要 |
PURPOSE:To improve the accuracy of defect detection by generating stress by applying external force to the welded zone of a steel pipe and then receiving an acoustic emission (AE) wave from a defect in welding at this time. CONSTITUTION:The welded steel pipe 7 has stress at the welded zone 8 after being cooled, so a rubber roll 6 is pressed against the steel pipe 7. A nozzle 9 to which a transducer 10 is fitted is installed in the pipe so as to detect the AE wave generated at this time, and water is jetted from the nozzle to the pipe. The AE wave generated at the defect is transmitted through the pipe and water in order and received by the transducer 10, so that the defect in welding of the seam welded pipe is detected with high accuracy without any destruction.
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