System for controlling a high plasma torch with high flow rates of plasma- generating gas

摘要

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.