Pilot arc circuit for a contact start plasma torch
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United States of America Patent
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-
Nov 10, 2009
Grant Date -
Apr 10, 2008
app pub date -
Sep 11, 2006
filing date -
Sep 11, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A contact start plasma system is provided that includes a passive pilot arc circuit that decreases the size and cost of the system. The plasma arc system includes a torch body, an electrode having a longitudinally disposed axis and mounted in the body, a nozzle having a longitudinally disposed axis, the nozzle axis being disposed substantially collinearly with the electrode axis, a power supply coupled to the electrode, the nozzle and a workpiece, the power supply providing a current for operating the torch in a pilot arc mode and a transferred arc mode, a gas source coupled to the plasma chamber, the gas source providing gas for operating in a pilot arc mode and a transferred arc mode, and a passive pilot arc circuit coupled between the power supply and the nozzle, the passive pilot arc circuit controlling the operation of the torch in the pilot arc mode. Either the electrode or the nozzle can be translatable for blow-forward or blow-back mode of operation.
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