Metal fusion bonding – Process – With subsequent treating other than heating of bonded parts...
Patent
1994-08-26
1997-01-28
Bradley, P. Austin
Metal fusion bonding
Process
With subsequent treating other than heating of bonded parts...
228219, 148286, B23K 3102, B23K 3538
Patent
active
055971091
ABSTRACT:
The invention has as an object thereof to provide a welding method which is capable of forming an oxide passivated film, which is corrosion resistant, non-catalytic, and has an extremely small amount of released gasses, chiefly on the welded portion or in the vicinity thereof during the welding process. During the welding process, a gas in which 800 ppm.about.2.5% of moisture is contained in an inert gas is caused to flow, and a passivated film having chromium oxide as a chief component thereof is formed on the surface of the welded portion. The welding method comprises a welding process and a passivation process; in the passivation process, a gas in which 1000 ppm.about.2.5% of moisture is contained in an inert gas is employed. The apparatus is provided with a system for generating moisture, a system for supplying an inert gas or a mixed gas in which hydrogen is added to an inert gas as a back shield gas, a system for supplying a back shield gas comprising an inert gas containing moisture, and a mechanism for supplying these gasses to the portion to be welded via switching of both systems.
REFERENCES:
patent: 2502855 (1950-04-01), Kingston
patent: 4956537 (1990-09-01), Schnorrer
patent: 5231258 (1993-07-01), Hunt
patent: 5388753 (1995-02-01), Bjorkman, Jr.
Miyoshi Shinji
Mizuguchi Yasumitsu
Ohmi Tadahiro
Bradley P. Austin
Knapp Jeffrey T.
Osaka Sanso Kogyo Kabushiki Kaisha
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