General Atomic Company

John R Odell

Kenneth H Holko

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.

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San Diego, CA, United States of America

John R Odell