Automatic ultrasonic flaw detection method and apparatus of welded section

TLDR: In this article, an automatic ultrasonic flaw detection method of a welded section, the pulse reflection method for performing the vertical square scanning of a probe, in a direction along a welding line and a direction at right angles to the welded line, and the TOFD system for scanning the probe in a compass direction along the welding line are combined so as to be compound flaw detection.

Abstract: PROBLEM TO BE SOLVED: To obtain an automatic ultrasonic flaw detection method and an automatic ultrasonic flaw detection apparatus of welded sections for surely detecting flaws and reducing the flaw detection time by combining a pulse reflection method and a TOFD method. SOLUTION: In the automatic ultrasonic flaw detection method of a welded section, the pulse reflection method for performing the vertical square scanning of a probe, in a direction along a welded line and a direction at right angles to the welded line, and the TOFD system for scanning the probe in a direction along the welded line are combined so as to be compound flaw detection. In the automatic ultrasonic flaw detection apparatus of the welded section, a rail is installed in parallel with the welded line, a body that can drive while being guided by the rail is installed, a movable shaft that can slide at right angles to the driving direction of the body, a fixed shaft that is extended in the same direction are provided, a probe for pulse reflection is fitted to the movable shaft, and the probe for TOFD is fitted to the fixed shaft.