Weld crack detection method and weld crack detection device

摘要

PROBLEM TO BE SOLVED: To appropriately detect a crack generated between a molten layer and a base metal layer. A crack detection method is a method of detecting a crack in a welded portion (30) of an object (10). In this crack detection method, a current is generated between a pair of electrode terminals 2a and 2b that straddle the welded portion (30) and are arranged on the first surface (10a) and the second surface (10b) of the object (10), respectively. In the applied state, the measurement terminal (3a) arranged between the welded portion (30) on the first surface (10a) and the electrode terminal (2a), and the welded portion (30) on the second surface (10b). ) And the step of measuring the potential difference between the measuring terminal (3b) arranged between the electrode terminals (2b) and the step of detecting a crack in the welded portion (30) from the measurement result of the potential difference. [Selection diagram] Fig. 1