| 摘要 |
An ultrasonic flaw detection device where, when .alpha.i is the incident ang le of an ultrasonic wave sent from an ultrasonic probe (1), in the circumferential direction of a tubular material (P) whose flaw is to be detected, .beta.i is the incident angle of an ultrasonic wave sent from the ultrasonic probe (1), in the axial direction of the tubular material (P), an d t/D is a wall thickness-to-outer diameter ratio of the tubular material (P), the circumferential incident angle .alpha.i and the axial incident angle .beta.i are set according to the wall thickness-to-outer diameter ratio t/D such that an inner surface refraction angle .theta.k that is calculated from .alpha.i, .beta.i, and t/D is not less than 35~ and not more than 60~.</SDOA B>
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