| 摘要 |
PURPOSE:To shorten the inspection time and to easily perform flaw detection at the bent part of a U-shaped tube by reflecting ultrasonic waves which are generated by plural ultrasonic wave generating elements by the conic surface of an ultrasonic wave reflecting mirror in mutually different directions. CONSTITUTION:An element support body 21 where plural ring-shaped ultrasonic wave generating elements 20a - 20c are arrayed concentrically with the axis of the tube 10 is mounted on the front surface of a rear sealed body, and a front sealed body 8 where an ultrasonic wave reflecting body 22 is stuck is fixed on its front surface. On the reflecting body 22, the conic ultrasonic wave reflecting mirrors 23a - 23c which differ in tilt angle are formed opposite corresponding to the respective elements 20a - 20c. Then when high-voltage pulses are applied to the elements 20a - 20c from an ultrasonic wave flaw detector 9 at constant intervals of time, ultrasonic waves are generated and propagated in the reflection body 22 to reach the reflecting mirrors 23a - 23c. They are reflected almost completely by the reflecting mirrors and propagated as an ultrasonic wave f1 perpendicular to the wall surface - a surface ultrasonic wave f3 along the internal surface of the tube. Consequently, plural (3) kinds of flaw detection are performed almost simultaneously. |
