| 摘要 |
A gas ionizable to produce a plasma is introduced into a arc head and a plasma discharge is initiated at voltages less than 50 V between a high resistance helix, impregnated with low work function materials, within the arc head, and a downstream arc channel electrode. Plasma from this discharge migrates into a gap between the arc channel electrode and a weld work piece creating a conducting path adequate to draw a high current arc column from the arc head to the weld work piece at arc initiation voltages less than 50 V. Increased energy density and penetration of the melt zone at the weld work piece is enabled by a predominately axial magnetic field around the arc column, with other magnetic fields enabling manipulation of the arc column over the weld work piece. Further manipulation of the arc head plasma discharge allows a vigorous metal vapor deposition process to be performed which can be sustained simultaneously with a welding operation.
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