Electric heating – Metal heating – By arc
Patent
1981-02-20
1983-12-27
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PR, 219121PP, 219 75, 31323131, B23K 900
Patent
active
044233043
ABSTRACT:
Disclosed is a transferred arc plasma torch in which a tubular anode is mounted in a bore at the lower end of a barrel of the torch, the bore being formed at a preselected angle to the axis of the barrel. The cathode is a length of tungsten rod which is held in a coaxial relation with the anode by cementing the end of an electrode holder, which mounts the cathode, into an insulating tube which extends through the barrel and forming a silicone rubber sleeve between the insulating tube and a bore formed in lower portions of the barrel such that the sleeve adheres to the insulating tube and the barrel. The silicone rubber sleeve and the cemented connection between the insulating tube and the cathode holder are formed adjacent one end of the anode so that the cemented end of the electrode holder is substantially fixed in relation to the anode. A tapered bore is formed in the electrode holder, coaxially with the anode, and a similar taper is formed on one end of the cathode so that the cathode can be inserted into the bore formed into the electrode holder. Shallow spiral grooves are formed in the tapered portion of the cathode and in the bore in the electrode holder and the tapered portion of the cathode is silver plated to enhance the grip of the electrode holder on the cathode.
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Bass Charles E.
Bass Harold E.
Bass James L.
Bass Peter J.
Bass Richard E.
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