| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection method capable of accurately detecting in a simple structure and in a short period the length and the depth of the flaw caused in a region, which has acoustic anisotropy like a welded part, the bending or attenuation of an ultrasonic wave and the noise such as an echo or the like returned from the boundary of a matrix part and a molten metal part; and to provide an ultrasonic flaw detection apparatus. SOLUTION: A scanning mechanism is loaded with a structure, wherein a first ultrasonic probe, which has a first ultrasonic probe having single vibrators arranged therein and diffusing an ultrasonic wave at a fixed angle to perform reception and transmission, and a second ultrasonic probe, which is a fixed angle bundling type and receiving the ultrasonic wave emitted from a first probe to be reflected, are integrated and constituted so that an inspection target is subjected to reciprocal scanning in scanning width wherein the half value widths of the bundling diameter of a second probe are overlapped with each other and the presence of the flaw and length of flaw in the inspection target are detected on the basis of the reflected ultrasonic wave received by the first probe and the depth of the flaw is evaluated and detected on the basis of the ultrasonic wave received by the second probe. COPYRIGHT: (C)2007,JPO&INPIT
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