Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1991-10-07
1993-07-27
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
228219, B23K 916
Patent
active
052312585
ABSTRACT:
A sliding backpurge device for supplying shielding gas to an arc welding process comprises a concave primary gas chamber surrounded by inner and outer seals which define a pressurized secondary gas chamber therebetween. Pressurized secondary gas is supplied to the secondary gas chamber and primary gas is supplied to the primary chamber. Any leaks which do form, minimize impact on the shield gas within the primary chamber despite sliding engagement of the inner and outer seals over the surface to be welded since secondary gas rather than atmospheric gas leaks into the primary chamber.
REFERENCES:
patent: 4956537 (1990-09-01), Schnorrer
Edwards Robert J.
Matas Vytas R.
Shaw Clifford C.
The Babcock & Wilcox Company
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