Arc welder with timed control of arcing recovery and means for r

Details Arc welder with timed control of arcing recovery and means for r Arc welder with timed control of arcing recovery and means for r

1993-09-13

1994-08-30

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913051, B23K 9073

Patent

active

053430174

ABSTRACT:
An arc welder provided with a low frequency square waveform a.c. power supply as a main power supply for welding in order to improve its power of recovering an arc which may go out at the time of polarity transition of a welding load and an auxiliary d.c. power supply for super-posing its output upon the input of the main power supply to further improve the recovering power, in which a switching element is inserted in a supply path of the output of the auxiliary d.c. power supply and the switching element is put in conduction by a suitable control device only for a necessary shortest arc recovery time in order to reduce a power loss due to continuous supply of the auxiliary d.c. output. The welder may include a diode which is put in conduction in response to an excessive transient voltage induced at the input of an invertor of the main power supply at the time of polarity transition of the welding load and, in order to prevent excessive charge of the capacitor in this case, the conduction time of the switching element may be extended to discharge an excess charge through the switching element to the invertor when a voltage across the capacitor exceeds a predetermined value.

REFERENCES:
patent: 5264679 (1993-11-01), Martin

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