ULTRASONIC INSPECTION DEVICE AND ULTRASONIC INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an ultrasonic inspection device enabling a size of a welded part to be easily detected.SOLUTION: An ultrasonic inspection device relating to an embodiment includes: a vibration generation part for irradiating a first member with a laser beam and generating ultrasonic vibration; a detection part for detecting the ultrasonic vibration transmitted to a second member by the first member through a welded part; and an analysis part for analyzing the transmitted ultrasonic vibration detected by the detection part. The analysis part obtains: at least one of frequency and wavelength of the ultrasonic vibration detected by the detection part when a displacement in a thickness direction of the second member is maximized; and a section size of the welded part from a correlation between a preliminarily-obtained section size of the welded part located on a first-member-side surface of the second member and at least one of the frequency and wavelength of the ultrasonic vibration.