The weld penetration depth inspection method

摘要

The present invention when welding both ends or the entire peripheral edge of the abutting surfaces, can be reliably determined to lack and excess both of the welding penetration depth, allowing an equal butt weld penetration depth of the weld. In joint structure of the butt welding when welding the A butting surfaces both ends or the entire peripheral end of, for judging insufficient penetration, first for penetration excess determination, a second notch 2a, to form a 2b. After butt welding the first joint structure and determines the second notch 2a, by respectively projecting ultrasonic waves 5 to 2b to measure the reflected wave 6, the depth of acceptability penetration welds on the basis of both the reflected waves 6. This determination, it is performed on both ends of each part or all Shu-tan part of the abutting surfaces of the material to be welded 1, 1, to inspect the quality of the depth penetration welding of the same part. .BACKGROUND 4