Plasma arc torch and method of operation for reduced erosion of electrode and nozzle
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United States of America Patent
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Aug 17, 2004
Grant Date -
May 20, 2004
app pub date -
Nov 14, 2002
filing date -
Nov 14, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There are provided a plasma arc torch and associated methods for selectively switching between a working mode and a standby mode. An electric arc is established between an electrode and a workpiece, and the torch is operated selectively in the working and standby modes. In the working mode, the arc extends between the electrode and the workpiece, the arc has a working arc current, and a plasma gas flows through a nozzle at a working flow rate. In the subsequent standby mode, the arc extends between the electrode and the nozzle and has a current less than the working arc current. The gas flow rate in the standby mode can be reduced to less than the working flow rate, and the plasma gas can be switched from an oxidizing gas to a non-oxidizing gas.
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