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

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.