| 摘要 |
PURPOSE:To prevent the defect generation on welding zone by arranging electromagnetic oscillograph to the power set of a weld and by discriminating the welding state based on the waveform of the oscillograph. CONSTITUTION:A generator 4 is connected to a power set 5 and electromagnetic oscillograph is connected to the power set 5 via input circuit 14 as well. The control circuit 11 of the coil to turn on and off a main switch 9 is further provided with connection to the main circuit 8. When the trigger 3A of a welding gun 3 is pulled, a contact 13 actuates the oscillograph 6 by transmitting a starting signal to the oscillograph 6. The welding of the stud 2 for a base metal 1 is then performed with the actuation of the main switch 9 inside a controller 10. In this case, the waveform of the welding current is measured on the recording paper of the oscillograph 6 and the operator of the welding discriminates the welding state based on the waveform thereof. The generation of the welding defect can therefore be prevented.
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