Main arc ignition device and main arc ignition control method of plasma cutting machine
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United States of America Patent
Stats
-
Aug 23, 2005
Grant Date -
Jul 31, 2003
app pub date -
Jan 22, 2003
filing date -
Jan 30, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A main arc ignition method capable of extending lives of a plasma electrode and a nozzle. For this purpose, before or immediately after starting arc, a plasma torch is supplied with a plasma gas at least either at a lower flow rate or at lower gas pressure; the plasma gas is switched to a gas flow rate and gas pressure of a time of cutting a work, after pilot arc is ignited between an electrode and a nozzle, or after main arc is ignited between the electrode and the work; and when generation of the main arc between the electrode and the work is detected, a pilot current is interrupted promptly by a semiconductor switch which is interposed in series with a resistance, in a pilot current circuit that is connected to the nozzle and supplies the pilot current to the pilot arc.
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