WELDING FAILURE DETECTION METHOD, SEAM WELDING FAILURE DETECTION DEVICE, AND SEAM WELDING DEVICE

摘要

A seam welding failure judging method includes: a pulse detection step which detects a current value during seam welding in a welding pulse unit; and a failure judgment step which compares the welding pulse current value detected by the pulse detection step to a threshold value set independently for a plurality of welding pulse units or a plurality of welding pulse groups, so as to judge whether seam welding has failed. Thus, it is possible to accurately detect a welding failure during seam welding.