Welding malfunction detection manner, the seam welding malfunction detection device, the impulse detection step which

摘要

PROBLEM TO BE SOLVED: To highly accurately detect a weld defect in seam welding.;SOLUTION: A weld abnormality detecting method comprises a step of detecting the current value in seam welding with a welding pulse unit, and an abnormality judging step of judging the abnormality in seam welding by comparing the current value of the welding pulse detected in the step of detecting the pulse with a threshold value to be independently set for a plurality of welding pulse units or a plurality of welding pulse groups.;COPYRIGHT: (C)2008,JPO&INPIT