Plasmatorch with a common gas source for the plasm

专利名称：Plasmatorch with a common gas source for

the plasma and for the secondary gas flows

发明人：BRUCE O HATCH,RICHARD A SPAULDING申请号：US51591383申请日：19830720公开号：US4581516B1公开日：19900123

摘要：In the plasma arc torch of this invention the same gas may be used for

generating a plasma and for secondary gas flow for cooling the torch and the workpiece.A torch housing defines a chamber which has an outlet at the end of the housing. Thetorch also includes an electrode in the chamber near the outlet and means in thechamber for separating the gas flowing towards the outlet of the housing into a primarygas flow adjacent to the electrode for generating a plasma and a secondary gas flowaway from the electrode for cooling the torch and the workpiece. In the preferredembodiment, air may be used for both the plasma forming gas and the secondary gasand the electrode has a halfnium insert. The torch has a torch tip adjacent to theelectrode and the torch may be started without a pilot arc by touching the workpiecewith the torch tip. No standoff between the electrode and the workpiece needs to bemaintained and the torch operator simply drags the torch tip on the workpiece resultingin a more accurate cut or weld.

申请人：THERMAL DYNAMICS CORP

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