| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of inspecting fine cracking defects of a metallic material with high accuracy by using ultrasonic wave. SOLUTION: In this ultrasonic wave inspection method for inspecting the defects by applying the ultrasonic wave to the metallic material and receiving the transmitted wave, the presence or absence of defect is determined on the basis of a ratio of the amplitude of transmitted wave determined on the inspected material to that determined on the same material free from defects, or a transmission time of the transmitted wave determined on the inspected material to that obtained on the same material free from defects. COPYRIGHT: (C)2004,JPO&NCIPI
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