Gas flow control circuit for plasma arc welding

Details Gas flow control circuit for plasma arc welding Gas flow control circuit for plasma arc welding

1977-09-19

1979-11-20

Truhe, J. V.

Electric heating

Metal heating

By arc

219 74, B23K 900

Patent

active

041752252

ABSTRACT:
In plasma arc welding apparatus of a type including a plasma arc torch which is movable relative to a welding stock and transforms orifice gas into a plasma jet stream directed toward the welding stock, the flow of orifice gas is regulated by a throttle valve, a motor adjusting the valve under the influence of adjustable timing means capable of selectively increasing, decreasing and maintaining at a steady state the flow of orifice gas toward the torch. In order to accurately regulate the throttling valve, the timing means preferably includes an adjustable cam assembly driven by the motor along with the valve and operatively coupled with the motor by one or more switches capable of regulating motor operation in order to achieve desired flow control by the valve.

REFERENCES:
patent: 3118052 (1964-01-01), Lippart et al.
patent: 3471674 (1969-10-01), Gage
patent: 3602683 (1971-08-01), Hishida et al.
patent: 3646311 (1972-02-01), Cameron et al.

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