| 摘要 |
PURPOSE:To make ultrasonic flaw detecting operation efficient and easy, to reduce the facility quantity, and to shorten the operation time by making ultrasonic waves incident in two circumferential and axial directions at the same time and setting the incidence angles of the ultrasonic waves optionally. CONSTITUTION:For the flaw detecting operation from inside a tube material 23, a circumferential flaw detection unit 2 and an axial flaw detection unit 3 are provided. The unit 2 consists of an ultrasonic probe 21a, a mirror 5 for circumferential incidence, and a circumferential incidence angle setting part 7 and the unit 3 consists of an ultrasonic wave probe 21b, a mirror 6 for axial incidence, and an axial incidence angle setting part 8. A mirror 5 is fitted to the setting part 7 at a specific angle to the center line of a probe 1 and rotates around the center line as a center of rotation together with the setting part 7 to vary the angle of circumferential incidence of an ultrasonic wave on the tube material 23 optionally. Further, a mirror 6 is fitted slantingly to the center line of the setting part 8 and this fitting angle is varied to vary the angle of axial incidence on the tube material 23 optionally. |
