| 摘要 |
PROBLEM TO BE SOLVED: To provide a flaw detection method capable of simply detecting the flaw produced in an inspection target part difficult to inspect, such as, a welded part at a high speed in a non-contact state, regardless of the thickness and the material of an inspection target, the shape of the welded part, or the like, and to provide a flaw detector used therein. SOLUTION: Ultrasonic waves are transmitted to the inspection target from a probe, while the ultrasonic waves that propagate through the inspection target are received, to detect the flaw of the inspection target part by the receiving signal. The probe is scanned along the inspection target part in a non-contact state, and the respective receiving signals of a plurality of kinds of the ultrasonic waves propagated through the inspection target are displayed as the image of at least either of a B-scope or a C-scope. The flaw is detected on the basis of the existence of the change part R2 in the image. COPYRIGHT: (C)2008,JPO&INPIT
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