Metal fusion bonding – Process – With pretreating other than heating or cooling of work part...
Reexamination Certificate
2005-11-08
2005-11-08
Cooke, Colleen P. (Department: 1754)
Metal fusion bonding
Process
With pretreating other than heating or cooling of work part...
C228S262100
Reexamination Certificate
active
06962283
ABSTRACT:
The present invention provides a welding method for materials to be welded which are subjected to fluoride passivation treatment, and a fluoride passivation retreatment method, wherein, when fluoride passivation retreatment was conducted after welding, there is no generation of particles or dust, and superior resistance is provided to fluorine system gases.In the present invention, when materials to be welded comprising stainless steel subjected to fluoride passivation treatment are welded, hydrogen is added to the gas (the back shield gas) flowing through the materials to be welded. Furthermore, in the welding method for materials to be welded which are subjected to fluoride passivation treatment in accordance with the present invention, the thickness of the fluoride passivated film in a predetermined range from the butt end surfaces of the materials to be welded, comprising stainless steel subjected to a fluoride passivation treatment, is set to 10 nm or less, and welding is conducted. Furthermore, in the fluoride passivation retreatment method in accordance with the present invention, after conducting the welding method described above, at least the welded parts are heated, and a gas containing fluorine gas is caused to flow in the interior part.
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Nakamura Osamu
Nitta Takahisa
Ohmi Tadahiro
Shirai Yasuyuki
Cooke Colleen P.
Knuth Randall J.
Ohmi Tadahiro
Stella Chemifa Kabushiki
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