| 摘要 |
PROBLEM TO BE SOLVED: To excellently discriminate defective products caused by a shunt and scattering of a welded part. SOLUTION: A welding means for welding a welding work 16 by feeding AC of a prescribed cycle between welding electrodes 15a, 15b for a specified time and a voltage or current measuring means 20 for measuring voltage or current between welding electrodes 15a, 15b in the late period, for example, the last one cycle of a specified time for feeding the AC between the welding electrodes 15a, 15b are provided, and the quality of welding is judged based on a measured voltage or current value by the voltage or current measuring means 20.
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