Metal fusion bonding – Process – With shaping
Patent
1990-10-17
1992-09-08
Heinrich, Samuel M.
Metal fusion bonding
Process
With shaping
228172, 228208, 228239, B23K 119
Patent
active
051451034
ABSTRACT:
A process for producing non-corrosive double-wall tubing in which an unbrazed, unsealed continuous double-wall tube of a given circumference is formed from a metal sheet composed of a first non-ferritic metal having a first defined region of exposed non-ferritic metal and a second region of a second metal in overlying relationship thereto, said exposed region having a width essentially equal to the circumference of the finished tube. The process including the steps of elevating the surface of the stainless steel to a brazing temperature while maintaining the material in a humidified gaseous atmosphere consisting essentially of a non-reactive carrier gas and reactive gas present in sufficient concentrations to achieve fluxing; maintaining the surface temperature of the steel for an interval sufficient to permit fusion between the selected metal and the non-ferritic steel surface; after metal fusion has been achieved, allowing the resulting fused metal material to cool to a first lowered temperature in a controlled non-oxidative atmosphere at a rate which retards the formation of fine-grained steel crystals in the metal; and after reaching a metallurgical transformation point, rapidly cooling the fused metal in a controlled atmosphere to a temperature below which the brazing metal is not reactive with oxygen. This process can be employed successfully in manufacturing unique, double-wall tubing which is relatively flexible and highly corrosion resistant.
REFERENCES:
patent: 2092018 (1937-09-01), Quarnstrom
patent: 2373116 (1945-04-01), Hobrock
patent: 2772121 (1956-11-01), Meissner
patent: 2996799 (1961-08-01), Gaul
patent: 3400449 (1968-09-01), Maguire et al.
patent: 5042710 (1991-08-01), Siemors et al.
Metals Handbook Ninth Edition, vol. 6, pp. 1001-1013, "Brazing of Stainless Steels", copyright 1983.
Alfred Teves GmbH
Heinrich Samuel M.
Lewis J. Gordon
Seitter Robert P.
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