ULTRASONIC FLAW DETECTION METHOD FOR CAST STICK AND ULTRASONIC FLAW DETECTION DEVICE

摘要

This object aims to provide a ultrasonic flaw detection method that uses a longitudinal wave as an incident wave for the inspection of a cast stick with a circular cross section and can inspect the overall region of the cast stick. When a plurality of phased array type probes (1) and (2) are arranged at a predetermined angle (a) in a circumferential direction of a cast stick (S) with a circular cross section for ultrasonic flaw detection, the arrangement is made for one arbitrary phased array type probe (1) so that unexamined regions (1A) and (1B) with a longitudinal inclined angle wave and a longitudinal vertical wave of the arbitrary phased array type probe (1) can be complemented with regions examined by the application of a longitudinal inclined angle wave and a longitudinal vertical wave of the other arbitrary phased array type probes (2).