| 摘要 |
PROBLEM TO BE SOLVED: To realize tandem flaw detection even for a steel pipe with thickened wall portions on inner surface. SOLUTION: This device is provided with a transmitting part 6 for making an ultrasonic wave incident into the weld zone of a welded part 2 in a pipe axis direction of a pipe (steel pipe 1) and a receiving part 7 for receiving a part or whole of the reflected wave 9 reflected by the welded zone 2. The transmitting part 6 and the receiving part 7 are equipped with a transmitting/receiving part arranged in a circumferential-direction of the pipe composed of one or two or more different oscillator groups on the array probe 5 for detecting flaw. When flaw of the pipe 1 is detected with this ultrasonic flaw detecting device, the wall thickness of the pipe 1 is measured and the propagation path of ultrasonic for scanning in the thickness direction of the pipe 1 are computed using the array probe 5 for detecting flaw based on the measured thickness distribution. Based on the computed propagation path, the oscillator groups corresponding to the transmitting part 6 and the receiving part 7 on the array probe 5 for flaw detecting are changed, or the angle of the array probe 5 for detecting flaw is controlled to be changed for scanning in the thickness direction of the pipe 1. COPYRIGHT: (C)2009,JPO&INPIT
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