METHOD FOR INSPECTING WELD PENETRATION DEPTH

摘要

[Problem] To make it possible to reliably determine, when the entire peripheral edge or both end sides of a butted face are welded, whether or not the weld penetration depth is either insufficient or excessive, and to enable butt welding in which the penetration depths of the welded portions are equal. [Solution] A butt-welded joint structure in which the entire peripheral edge or both end sides of the butted face are welded, wherein first and second cutouts (2a, 2b) for determining insufficient penetration and determining excessive penetration are formed. After butt welding, ultrasound (5) is beamed onto each of the first and second cutouts (2a, 2b) of the joint structure and the reflected wave (6) is measured, and the acceptability of the weld penetration depth is determined on the basis of both of the reflected waves (6). This determination is performed on the entire peripheral edge portion or both end side portions of the butted face between the welded materials (1, 1), and the acceptability of the weld penetration depth of the corresponding portions is inspected.