Process for operating a plasma arc torch
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United States of America Patent
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Jan 13, 2004
Issued Date -
N/A
app pub date -
Jul 23, 2002
filing date -
Oct 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for operating a plasma torch having an improved start up and shut down sequence to substantially increase electrode element life. The first shut down mode is controlled such that plasma gas flow through the swirl ring and nozzle prevents the formation of an oxide layer upon the electrode. The shut down method is especially useful for torches which operate at 100 amps or greater. The inclusion of an aluminum jacket surrounding the electrode outer walls has been found to contribute to the ability to avoid formation of oxide layers on the electrode.
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