抄録
When the stored energy of an electrolytic capacitor of the spot welder is discharged through the primary circuit of the welding transformer by providing an electromagnetic switch, electrical phenomena such as high frequency oscillation or arc appear between the switching contacts. Though the high frequency oscillation is due to an electrical cause, the arc is attributable to the mechanical chattering of the contacts.
The modes of arc occurrence are analyzed and the mechanical chattering of contacts is rendered visible by means of oscilloscope.
The theoretical consideration of the chattering mechanism showing that the contact chattering is reduced by min imizing the momentum of the moving part of a switch and the contact gap length as well as by increasing the contact force, is verified by a series of experiments.
