Arc length control for plasma welding

Details Arc length control for plasma welding Arc length control for plasma welding

1987-07-30

1988-08-23

Paschall, M. H.

Electric heating

Metal heating

By arc

21912402, 2191304, 21912154, 21912156, B23K 900

Patent

active

047662867

ABSTRACT:
For use with plasma arc welding apparatus, a control system is set forth. The plasma arc welding apparatus includes a plasma arc power supply (12), a contactor (20), and an electrode assembly for moving the electrode (32) relative to a work piece (22). The electrode assembly is raised or lowered by a drive motor (24). The present apparatus includes plasma arc adapter (48) connected across the power supply to measure the voltage across the plasma arc. The plasma arc adapter forms a DC output signal input to a differential amplifier (60). A second input (58) is defined by an adjustable resistor (56) connected to a DC voltage supply to enable operator control. The differential amplifier forms an output difference signal provided to an adder circuit (64). The adder circuit then connects with a power amplifier (68) which forms the driving signal for the motor. In addition, the motor connects to a tachometer (70) which forms a feedback signal delivered to the adder to provide damping, thereby avoiding servo loop overshoot.

REFERENCES:
patent: 3236997 (1966-02-01), Johnson et al.
patent: 3562581 (1968-03-01), Sonju
patent: 4017707 (1977-04-01), Brown et al.
patent: 4101754 (1978-07-01), Fischer
patent: 4170727 (1979-10-01), Wilkins
patent: 4324971 (1982-04-01), Frappier
patent: 4678888 (1987-07-01), Camacho et al.
patent: 4682004 (1987-07-01), Schmall

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