| 摘要 |
PURPOSE:To perform flaw detection over the entire surface of the bevel part of a steel tube by setting a probe at a specific position from a tube end by using a tube end detector and detecting the rotating speed of the steel tube, and feeding the probe axially by certain pitch at specific time. CONSTITUTION:Two probes S1 and S2 and the end part detector 2 are arranged axially in order. When a probe holder 1 is inserted into the steel tube X along its internal surface. The end part detector 2 detects the end part and a controller 4 outputs a signal to an actuator 5 to position the holder 1. As the steel pipe X is rotated, its rotation is detected by a pulse generator 5 and sent to the controller 4. The probe holder 1 is fed by pitch corresponding to the size of a sound field every time the steel pipe X makes one turn to perform the flaw detection successively. The pitch feed is only carried out on one turn plus alpha so as to prevent a miss in scanning during the pitch feed. In a final area, the rotation is stopped after one turn plus alpha.
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