| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection method for a round bar material, which accurately detects a surface flaw as distinguished from a surface layer flaw, without influence from the surface roughness of the round bar material or from the presence or absence of a support part. <P>SOLUTION: Transverse ultrasonic waves enter into the inner part of a round bar material from the same direction at two different sector scanning angles. When the intensity of the reflection wave of the transverse incident wave with a relatively-small sector angle exceeds a threshold, a surface flaw is determined to be present. When the intensity of the reflection wave of the transverse incident wave with a relatively-large sector angle exceeds a threshold, a surface layer flaw is determined to be present. An example of the relatively-small refractive angle is approximately 33°, and an example of the relatively-large refractive angle is approximately 41°. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
