Plasma cutting method
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Aug 12, 1997
filing date -
Feb 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plasma cutting method for use in a plasma cutting apparatus having a nozzle with an orifice in which a plasma arc is pinched and thereby narrowed and densified and a flushing secondary gas for surrounding a forward end portion of the nozzle. Also, a non-oxidizing gas is caused to flow as a plasma gas to start the arc and a non-oxidizing gas is caused to flow as the secondary gas to start the arc so that a non-oxidizing gaseous atmosphere may prevail in the vicinity of an outlet of the above mentioned nozzle.
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