ULTRASONIC INSPECTION DEVICE AND ULTRASONIC INSPECTION METHOD

PROBLEM TO BE SOLVED: To provide an ultrasonic inspection device capable of detecting a damage occurring in a welding heat affected zone selectively, easily in a short time.SOLUTION: The ultrasonic inspection device for inspecting a weld part using ultrasonic wave includes at least one ultrasonic sensor and an operation section. The ultrasonic sensor transmits ultrasonic wave to the weld part and receives the reflected wave. The operation section identifies a weld heat affected zone on the basis of a first received signal acquired by scanning the weld part with the ultrasonic sensor for region identification (step S101), detects a weld defect or damage in the weld part on the basis of a second received signal acquired by scanning the weld part with the ultrasonic sensor for damage analysis, extracts a damage existing in the identified weld heat affected zone 10C (step S102), and calculates a damage rate as a degree of the extracted damage (step S104).