PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection device for a pipe weld zone, that avoids interference between ultrasonic waves even when ultrasonic flaw detection is performed from both sides by holding the weld zone and also shortens an inspection time.;SOLUTION: An ultrasonic flaw detection device 10 for a pipe weld zone 3 where the respective end surfaces of a first pipe 1 and a second pipe 2 are welded with abutment includes: a first probe 11 arranged on the outer peripheral surface of the first pipe 1; a second probe 12 arranged on the outer peripheral surface of the second pipe 2; movement mechanisms 24, 27 for interlocking the first probe 11 and the second probe 12 to move in the circumferential direction of the pipes along the weld zone 3; position sensors 21, 22 for acquiring position information of each one of the first probe 11 and the second probe 12; and interference prevention means for preventing the mutual interference of ultrasonic waves to be originated or received by the first probe 11 and the second probe 12.;COPYRIGHT: (C)2013,JPO&INPIT
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