ULTRASONIC PROBE, ULTRASONIC FLAW DETECTOR, ULTRASONIC FLAW DETECTING METHOD AND PRODUCTION METHOD OF SEAMLESS PIPE

摘要

The ultrasonic testing method according to the invention includes the steps of arranging an ultrasonic probe 1 having a plurality of transducers 11 so as to face a tubular test object P, and causing the transducers appropriately selected from the plurality of transducers to transmit and receive ultrasonic waves so that the ultrasonic waves are propagated in the tubular test object in a plurality of different propagation directions, wherein a ultrasonic testing condition by the ultrasonic probe is set so that respective external refraction angles ¸r of the ultrasonic waves in the plurality of propagation directions are approximately equivalent and/or respective internal refraction angles ¸k of the ultrasonic waves in the plurality of propagation directions are approximately equivalent.