Importance

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Abstract

A plasma welding and cutting gun for discharging plasma gas with constant outlet pressure includes a gun body having a negative-electrode jacket for directing welding and cutting gas into the gun, a core tube through which the gas flows through a gas outlet of the negative-electrode jacket disposed around the core tube and then discharged through a nozzle secured to a lower portion of the gun body, and a positive-electrode sleeve secured to an outer portion of the gun body and connected to the nozzle, wherein the nozzle serves as a positive-electrode terminal and the gas directed into a passage between the nozzle and a negative-electrode terminal secured to a lower portion of the negative-electrode jacket will be ionized by an arc formed between the nozzle and the negative-electrode terminal, and then discharged through the nozzle to form plasma arc of high temperature and high velocity for welding and cutting a work piece, and wherein an over-pressure relief valve is provided between the core tube and negative-electrode jacket for discharging a gas streamflow through a by-pass gas discharge passage when a main gas streamflow having its pressure exceeding a pre-determined constant pressure, thereby keeping a constant gas pressure for the plasma main gas streamflow in order to enhance the stability and quality of plasma welding and cutting.

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First Claim