| 摘要 |
PROBLEM TO BE SOLVED: To quantitatively broaden the working range of an arc even though the heat centralization of the arc is high by rotating and driving a nozzle member with a work directive line as an essential center by a driving mechanism. SOLUTION: In accordance with the rotational drive of a nozzle member 2 by a driving means. The outer opening of the nozzle 2a is deviated byθfrom a work directive line Lo. Therefore, the center line of the nozzle 2a is rotated so as to draw a conical face, so that plasma emitted from the nozzle 2a is also rotated so as to draw the conical face. Since a work is irradiated with plasma at the lower bottom side of the cone, the plasma working range is made broad for the work in the average of time series. Accordingly, even if the aiming position of a torch is deviated a little, the objective place is acted with the plasma arc. The welding is enabled even of the copy preciseness is low, further, the foot length is long or the gap of matching part is wide.
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