Metal inert gas welding system for use in vacuum

Details Metal inert gas welding system for use in vacuum Metal inert gas welding system for use in vacuum

1993-09-20

1994-08-02

Shaw, Clifford C.

Electric heating

Metal heating

Nonatmospheric environment at hot spot

219137R, B23K 900

Patent

active

053348133

ABSTRACT:
Disclosed are a device and a method for inert gas plasma welding in a low pressure or vacuum environment. The device comprises: (1) a pre-plasma cavity having (a) a first opening therein capable of accepting an inert gas into the pre-plasma cavity, (b) first and second electrodes within the pre-plasma cavity capable of applying an electromagnetic field to the inert gas to thereby convert the inert gas into a plasma and (c) a second opening capable of allowing the plasma to exit the pre-plasma cavity and (2) a structure capable of directing the plasma from the second opening of the pre-plasma cavity to an arc welding cavity adjacent the second opening, the arc welding cavity capable of being placed adjacent to a working surface, the arc welding cavity further capable of accepting a welding material therein, the plasma impinging on the working surface and the welding material, the directing means focusing the plasma within the arc welding cavity to thereby increase a rate of heat transfer between the plasma and the working surface and the welding material. The present invention allows welding to be done in a vacuum by preventing the vacuum from prematurely dispersing the plasma.

REFERENCES:
patent: 2933594 (1960-04-01), Johnson et al.
patent: 3600549 (1971-08-01), Olshansky et al.
patent: 4174477 (1979-11-01), Essers et al.
patent: 5149932 (1992-09-01), Poorman et al.

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