| 摘要 |
<p>A plasma arc torch that is capable of operating in a non-transferred arc mode and a transferred arc mode, and that is intended foruse with a plasma arc treatment system. The plasma arc torch (16) includes an electrode (38), a plasma gas ring (46) and anozzle (18). At least one power supply (34) within the plasma arctreatment system (10) is connected to the electrode (38), the no zzle (18) and a workpiece (14). While the torch operates in a non-transferred arc mode, the non-transferred arc heats gas supplied by the plasma gas ring (46) to create plasma gas that heats the workpiece (14) to raise its conductivity. Once the workpiece (14) is at an appropriately conductive level, the arc (44A) is automa tically transferred since the ground point can now be found.</p> |
