Patent ID: 8100014

Claim:
An ultrasonic flaw detection apparatus comprising: an angle probe, a normal probe, and a switching circuit for permitting connection of the angle probe and the normal probe to a transmission unit and a reception unit of a flaw detector to be switched, wherein the switching circuit selects an angle flaw detection mode for transmitting and receiving an ultrasonic beam only by the angle probe, an SPOD mode for transmitting the ultrasonic beam by the angle probe and receiving a diffracted wave propagating on a flaw detection surface above a flaw by the normal probe, a mode for simultaneously executing the angle flaw detection mode and the SPOD mode for transmitting the ultrasonic beam by the angle probe and receiving a reflected wave by the angle probe as well as receiving the diffracted wave propagating on the flaw detection surface above the flaw by the normal probe, and a normal flaw detection mode for transmitting and receiving the ultrasonic beam only by the normal probe.