Current unit for arc welding

Details Current unit for arc welding Current unit for arc welding

1980-09-19

1984-03-27

Shaw, C. C.

Electric heating

Metal heating

By arc

B23K 910

Patent

active

RE0315443

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 controlling the operating frequency of the converter in a manner such that it is substantially inversely proportional to the square of the input voltage of the current supply unit, thereby maintaining the power output of said unit substantially unchanged irrespective of changes in load caused by the welding operation and irrespective of variations in said input voltage.

REFERENCES:
patent: 3330933 (1967-07-01), Maklary
patent: 3382345 (1968-05-01), Normando
patent: 3684942 (1972-08-01), Petit, Jr. et al.
patent: 3728516 (1973-04-01), Daspit
patent: 3894210 (1975-07-01), Smith et al.
patent: 3895212 (1975-07-01), Maxwell et al.

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