ULTRASONIC FLAW DETECTION METHOD AND APPARATUS

PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection method capable of evaluating a joint member of which the joint state of part of the joint part is defective and the other parts are satisfactory. SOLUTION: The ultrasonic flaw detection method comprises a step for arranging a joint material having an area smaller than that of each opposed surface of a base material and a material to be joined in a gap between the base material and the material to be joined; a step for detecting a depletion region in the opposed surfaces to which the joining material is not opposed; a step for joining the base material and the material to be joined between which the joint material is arranged; a step for irradiating the material to be joined included in the depletion region with an ultrasonic beam; and a step for receiving echoes reflected at the interface between the material to be joined included in the depletion region and the material to be joined. When the intensity of the echoes is larger than a previously set threshold value, joint failure is determined. COPYRIGHT: (C)2005,JPO&NCIPI