Main arc ignition device and main arc ignition control...

Details Main arc ignition device and main arc ignition control... Main arc ignition device and main arc ignition control...

2005-08-23

2005-08-23

Fuqua, Shawntina (Department: 3742)

Electric heating

Metal heating

By arc

C219S121500, C219S121390, C219S121460, C219S121590, C219S121510, C219S121440, C219S121550

Reexamination Certificate

active

06933463

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.

REFERENCES:
patent: 5506384 (1996-04-01), Yamaguchi
patent: 3-258464 (1991-11-01), None
patent: 5-104251 (1993-04-01), None
patent: 6-15457 (1994-01-01), None

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