| 摘要 |
PROBLEM TO BE SOLVED: To achieve a method and an apparatus for easily and accurately detecting such defect as fatigue cracks that are generated at a fillet-welding section using ultrasonic waves. SOLUTION: The ultrasonic flaw detection method performs ultrasonic flaw detection of defects, such as cracks that are generated at the fillet-welding section by applying ultrasonic waves that are generated by a transmission probe via welding beads at one side and receiving ultrasonic waves that are reflected by such defect as cracks, using a reception probe via welding beads at the opposite side. Additionally, in the ultrasonic flaw detection method, flaws are detected by focused ultrasonic beams.
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