| 摘要 |
A plasma arc torch which includes a torch body having a nozzle mounted relative to an electrode in the body to define a plasma chamber. The torch body includes a plasma flow path for directing a plasma gas to the plasma chamber in which a plasma arc is formed. The nozzle includes a hollow, body portion and a substantially solid, head portion defining an exit orifice. The torch also includes a shield attached to the torch body. The shield has a head portion and a body portion which defines a shield exit orifice that has an inlet and an outlet. The shield exit orifice is dimensioned such that the head portion of the nozzle extends, at least in part, to a position between the inlet and the outlet of the shield exit orifice. This configuration produces a substantially columnar flow of shield gas that does not substantially interfere with the plasma arc and prevents a substantial portion of splattered molten metal produced during marking or cutting of the workpiece from reaching the nozzle.
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