Gas metal arc welding system

Details Gas metal arc welding system Gas metal arc welding system

1980-08-04

1981-11-17

Shaw, C. C.

Electric heating

Metal heating

By arc

21913033, 21913031, 21913032, 21913051, 21913771, B23K 909

Patent

active

043013554

ABSTRACT:
Power delivered to the welding arc from a constant current rapid response power supply is controllable to maximize arc stability particularly in out-of-position welding operations. A first control modulates the output current from the power supply between a high value close to the maximum output value and a minimum value just sufficient to maintain the welding arc. The modulation is effected at a given frequency appropriately adjusted in accordance with the electrode material and diameter to maintain optimum spray metal transfer in the welding arc. A further control is effected by pulse width modulating the output from the power supply in accord with a set-in current programmed signal which is compared with a current feedback signal or, alternatively, a set in voltage programmed signal which is compared with a voltage feedback signal. This latter control provides for operation of the power supply in a constant current control mode or alternatively, a constant voltage control mode. Still further control of the power in the welding arc is effected by pulsing the current between base and peak levels at a relatively low frequency which enables control of the weld puddle in out-of-weld positions.

REFERENCES:
patent: 3956610 (1976-05-01), Kanbe et al.
patent: 4019016 (1977-04-01), Friedman et al.
patent: 4092517 (1978-05-01), Woodacre

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