Arc plasma torch and method using contact starting

Details Arc plasma torch and method using contact starting Arc plasma torch and method using contact starting

B - Operations, Transporting

23

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327/29

B23K 9/06 (2006.01) B23K 9/067 (2006.01) B23K 9/29 (2006.01) H05H 1/34 (2006.01)

Patent

CA 1307030

ARC PLASMA TORCH AND METHOD USING CONTACT STARTING ABSTRACT OF THE DISCLOSURE An arc plasma torch includes a moveable cathode and a fixed anode which are automatically separated by the buildup of gas pressure within the torch after a current flow is established between the cathode and the anode. The gas pressure draws a nontransferred pilot arc to produce a plasma jet. The torch is thus contact started, not through contact with an external workpiece, but through internal contact of the cathode and anode. Once the pilot arc is drawn, the torch may be used in the nontransferred mode, or the arc may be easily transferred to a workpiece. In a preferred embodiment, the cathode has a piston part which slidingly moves within a cylinder when sufficient gas pressure is supplied. In another embodiment, the torch is a hand-held unit and permits control of current and gas flow with a single control. -1-

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