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Dual mode plasma arc torch for use with plasma arc treatment system and method of use thereof

  • US 6,313,429 B1
  • Filed: 08/27/1998
  • Issued: 11/06/2001
  • Est. Priority Date: 08/27/1998
  • Status: Expired due to Term
First Claim
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1. A method of operating a plasma arc system that treats a workpiece, the method comprising:

  • providing a plasma arc device that includes an electrode, a plasma gas ring and a nozzle;

    providing at least one power supply having a first terminal connected to the electrode, a second terminal connected to the nozzle and a third terminal connected to ground and to the workpiece;

    supplying gas to the plasma gas ring;

    applying a first electrical potential to the electrode and applying a second electrical potential different from the first potential to the nozzle such that a potential difference is created therebetween;

    initiating a first arc between the electrode and the nozzle to form a plasma gas;

    heating the workpiece with the plasma gas to thereby raise the temperature of the workpiece to a conducting temperature; and

    automatically initiating a second arc between the electrode and the workpiece whenever the temperature of the workpiece reaches the conducting temperature such that a ground point is found by the second arc without extinguishing the first arc.

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