Arc welding current supply

Details Arc welding current supply Arc welding current supply

1980-09-19

1983-05-03

Shaw, C. C.

Electric heating

Metal heating

By arc

363136, B23K 910

Patent

active

043821715

ABSTRACT:
An a.c. operated arc welding current supply unit comprises a frequency converter of the series capacitor type and operating with a half period which is substantially less than the average duration of the current and voltage transients caused by short circuits through droplets of weld material during welding. The frequency converter is connected to welding electrodes through a transformer in series with a rectifier to provide direct current for the welding electrodes, and the frequency converter is associated with a control device for maintaining the operating frequency of the converter constant, thereby maintaining the arc power substantially unchanged irrespective of changes in load caused by the welding operation.

REFERENCES:
patent: 3728516 (1973-04-01), Daspit
patent: 3814888 (1974-06-01), Bowers et al.

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