High reliability double-chambered shielding system for welding

Details High reliability double-chambered shielding system for welding High reliability double-chambered shielding system for welding

1984-03-20

1985-07-09

Leung, Philip H.

Electric heating

Metal heating

Nonatmospheric environment at hot spot

219 591, 219 61, B23K 916

Patent

active

045284369

ABSTRACT:
An improved system (50) for shielding a circumferential region about elongate workpieces from air contamination during welding or heat treatment includes a pair of generally cylindrical shields (52, 54) which define central openings for receiving the workpieces, and which are positioned in longitudinally spaced apart relationship about the joint or region to be welded or heat treated. The shields (52, 54) are of symmetrical but otherwise identical construction. For example, the shield (52) includes a first annular chamber (70) and associated annular diffuser positioned adjacent the process zone, and a second annular chamber (86) and associated cylindrical diffuser (90) extending away from the zone. The chambers (70, 86) are connected to independent sources of inert gas, which flows both into and out away from the process zone to eliminate air contamination from aspiration and the like. A slotted sleeve (98) is preferably provided over the shields (52, 54) to substantially enclose the circumferential region therebetween.

REFERENCES:
patent: 2611848 (1952-09-01), Smith
patent: 2868950 (1959-01-01), Gage
patent: 2903559 (1959-09-01), Wempe
patent: 3652818 (1972-03-01), Erlandson et al.
patent: 3875364 (1975-04-01), Boyett
patent: 4000392 (1976-12-01), Banas
patent: 4278864 (1981-07-01), De Facci
patent: 4278868 (1981-06-01), Rudd et al.

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