System for controlling a high plasma torch with high flow rates

Details System for controlling a high plasma torch with high flow rates System for controlling a high plasma torch with high flow rates

1993-04-02

1994-03-15

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912155, 21912148, 21917157, 21917149, B23K 900

Patent

active

052947734

ABSTRACT:
System for controlling a plasma torch generating high power, including a rectifier feeding said torch; a circuit feeding said torch with plasma-generating gas, controlled by a regulating valve; and a controller for controlling the rectifier and the valve in order to control the arc current and the plasma-generating gas flow rate. The valve is actuated by an electropneumatic positioner associated with a pneumatic flow amplifier, the controller receives measurements of the arc voltage and arc current and delivers to the rectifier and to the electropneumatic positioner respectively, arc current and plasma-generating gas flow rate reference values adapted to produce a desired electrical reference power.

REFERENCES:
patent: 3646311 (1972-02-01), Cameron et al.
patent: 3819840 (1974-06-01), Schultz
patent: 3988566 (1976-10-01), Vogts et al.
patent: 4122327 (1978-10-01), Vogts et al.
patent: 4156125 (1979-05-01), Brown
patent: 4663515 (1987-05-01), Kneeland et al.
patent: 4692584 (1987-09-01), Caneer, Jr.
patent: 4916283 (1990-04-01), Nagasaka et al.

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