| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector and a method of ultrasonic flaw detection capable of efficiently and accurately conducting precise flaw detection based on the result of coarse flaw detection. SOLUTION: A control part 3 changes the scanning pitches of an ultrasonic probe 1 for conducting coarse flaw detection and precise flaw detection in a testpiece to detect a reflection source in the testpiece. The control part 3 is equipped with a precise detection range setting part 9, a precise detection scanning range computing part 10, and a drive control part 7. The setting part 9 determines whether the reflection source detected by the coarse detection requires precise detection or not based on positional data on the reflection source detected by the coarse detection and based on preset precise detection conditions, and if precise detection is required, it sets a precise detection range for conducting the precise detection. The computing part 10 computes a precise detection scanning range of the probe 1 covering the whole of the set precise detection range. The control part 7 moves the probe 1 to a detection starting position in the precise detection range by means of a drive part 2 to conduct the precise detection by rectangular scanning with scanning pitches smaller than those of the coarse detection.</p> |
