| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection method capable of easily and precisely detecting only the echo of a flaw present in a solid shaft member. SOLUTION: This ultrasonic flaw detection method for solid shaft member comprises the step of bringing an array probe formed of a plurality of ultrasonic oscillators provided on a plane into contact with the end surface of the solid shaft member, the step of imparting a transmit-receive delay to the oscillator group formed of two or more of a prescribed number of ultrasonic oscillators among the ultrasonic oscillators constituting the array probe so that the ultrasonic beams can be transmitted and received in a preset target position to perform a flaw detection, the step of scanning the ultrasonic beams in the vicinity of the target position in the axial direction and/or circumferential direction of the solid shaft member by changing the time of the transmit-receive delay within a prescribed range, the step of subjecting a flaw detection signal in each position obtained in the scanning to moving average processing, and the step of performing a flaw judgment on the basis of the flaw detection signal after the moving average processing.
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