Metal fusion bonding – Including means to apply flux or filler to work or applicator – Gaseous flux
Patent
1994-03-21
1995-02-14
Bradley, P. Austin
Metal fusion bonding
Including means to apply flux or filler to work or applicator
Gaseous flux
219 74, B23K 916
Patent
active
053887530
ABSTRACT:
A shield protects the back side of a molten and solidifying weld on a structure being welded from the deleterious effects of ambient gases, such as oxygen and nitrogen. The shield is in the form of a continuous tubular chamber surrounding an open central area, allowing clear viewing of the weld. The chamber is bounded by two spaced skins and inner and outer walls extending between the skins. An inert gas can be introduced into the chamber under pressure. One skin is generally planar and perforated, allowing the gas to exit the chamber. In use, the chamber is secured to a welding device for movement therewith, with the central opening opposite the weld head and the perforated skin adjacent to the panel being welded. As welding proceeds, an inert gas is fed into the chamber and escapes through the perforations and passes into the central area, preventing entry of ambient air which would contaminate the weld during welding and solidification of the weld.
REFERENCES:
patent: 1746081 (1930-02-01), Hobart
patent: 2918563 (1959-12-01), Ternisien et al.
patent: 4812611 (1989-03-01), Carleton
patent: 4956537 (1990-09-01), Schnorrer
Bradley P. Austin
Duncan John R.
Gilliam Frank D.
Knapp Jeffrey T.
Martin Marietta Corporation
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