Ultrasonic flaw detection method and device thereof

Abstract

An ultrasonic flaw detection device using a volume focus fault detection method is as follows. The device detects faults in the inside of an object to be tested having a substantially circular cross section, wherein resonators (1...1) are arranged like an arc along a circular formed by the object to be tested. Array probes (10...10) are arranged so as to surround the object using an oblique flaw detection method. The excitation means can detect faults of an object to be tested, and the excitation means causes the ultrasonic waves to be incident into the inside of the object through each of sections of incident sections by vibrating the plurality of the resonators once and to reach a section opposite to the incident section on the circumference of the circle formed by the object and causesa plurality of resonators to be incident into the inside of the object using another one-time vibration, and causes the incident ultrasonic waves to reach any one of neighboring sections adjacent to the opposite section.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection method and a device thereof. Background technique [0002] Patent Document 1: Japanese Patent Laid-Open No. 2003-130859 [0003] Patent Document 2: Japanese Patent No. 3704065 [0004] Patent Document 3: Japanese Patent Laid-Open No. 2006-250873 [0005] Non-Patent Document 1: Murakami Joko, Dominic Burakonie, Miura Shunji, Murai Junichi, Nishitani Toyo: The 13th Ultrasonic Wave にょる Non-breaking Soil Review Lecture Collection, pp.33-38, (2006) [0006] Non-Patent Document 2: Yokono Yasukazu: Status Quo of Standardization of Fiesdoare UT, NDI Document 21776, pp.34-38 (2006) [0007] In the conventional flaw detection method using a single vibrator, in the case of internal flaw detection of a cylindrical bar, etc., it is necessary not only for the axial direction of the bar, but also for the section intersecting the axial direction, along the The vibrator mechanically scans the circumference of th...

AI Technical Summary

Problems solved by technology

[0055] However, in reality, due to the reflection echo (surface echo) generated in the above-mentioned incidence interval, the area near the incidence interval inside the test material becomes a dead zone (insensitive zone) where it is difficult to detect defect echoes.

[0056] Furthermore, although it is very small compared with the dead zone in the above-mentioned incident side, due to the reflected echo (bottom echo) generated in the above-mentioned opposing zone opposite to the incident zone, there will be There is also a slight dead zone near the opposite edge

In addition, even if such a dead zone is neglected, as described above, in a cross-sectional view, it is possible to perform flaw detection together by one array probe in which a plurality of vibrators are arranged in an arc shape. The fan-shaped part of the interval is restricted, and the undetected area remains relatively wide in the tested material

Images