| 摘要 |
PURPOSE:To prolong the life of an electrode or nozzle, by providing an arc rotary drive oil and an arc control in adjacent relation to a double cylindrical electrode. CONSTITUTION:Voltage from a plasma power source 16 is applied to an outside electrode 13a and an inside electrode 13b through a nozzle 1 and an electrode support cylinder 8 to magnetic force parallel to the axial direction of the cylindrical electrode is generated by an arc rotary drive coil 14, the arcs 25a, 25b are revolved along both electrodes 13a, 13b. If line of magnetic force parallel to the circumferential direction of said cylindrical electrode is generated by arc control coils 15a, 15b provided in the vicinity of both terminals of the cylindrical electrode, the arcs 25a, 25b are reciprocally moved to the axial direction. Therefore, the arcs 25a, 25b move left and right while rotating the cylindrical electrodes 13a, 13b and the local heating of the electrodes can be avoided.
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