| 摘要 |
PURPOSE:To make it possible to ensure simple flaw detection, by dividing a part, whose flaw is to be detected, into several stages in the direction of a depth, combining and arranging a plurality of slant angle probes so as to measure the divided sections at individual depths separately, and detecting the flaw. CONSTITUTION:The height of a flaw part to be detected is divided into, e.g., four stages. The range of T/4 from the top is measured with slant angle probes 11 and 11'. The range of T/2 from the top is measured with slant angle probes 12 and 12'. The range of 3T/4 is measured with slant angle probes 13 and 13'. The transmitting probes are arranged at the positions close to the flaw detecting position. The receiving probes are arranged at the remote side from the flaw detecting position. For the remaining range of T/4, a slant angle probe 14 is arranged for one probe method. A material A, whose flaw is to be detected, or the probes 11 and 11'-13 and 13' and 14 are moved with the specified arrangement being kept. An echo from a defect is caught with the transmission and reception of ultrasonic waves from the probes. The entire surface of the vertical cross section of the flaw part to be detected is detected with the probes. The data, which are sent from the probes for each divided stage to the computer of a control part, are compared with the data, which are inputted beforehand, and operated with the computer. Thus the continuous state of the defect at the vertical cross section surface at the flaw part to be detected is judged. |
