| 摘要 |
PURPOSE:To ensure the ultrasonic wave flaw detection of the fine defects in a structure and a welded part of steel, by applying stress to the fine defects of a body to be checked, and detecting the flaws under the state the flaws are opened. CONSTITUTION:A load coupling ring 6 is provided around a body to be checked, e.g., a pipe 3. Loading cylinders 8 are attached to the inside of the load coupling ring 6. The cylinders 8 are compressed to the pipe 3 by hydraulic pressure. At this time, the hydraulic pressure is adjusted by handles 12. A supporting arm 7 is attached to the load coupling ring 6, and an ultrasonic wave probe 4 is provided on the arm 7. The pipe 3 is compressed by using such an ultrasonic-wave flaw detecting jig and the loading cylinders 8, and the fine flaw in the pipe is opened. Under this state, the ultrasonic wave is transmitted from the ultrasonic wave probe 4 and the flaw is detected. Therefore, even though the flaw is small with respect to the thickness and the opening part of the flaw is closely contacted, the fine defect can be positively detected based on the change in sound pressure reflectivity. |
