Pipes and tubular conduits – Distinct layers – Bonded to each other
Patent
1992-06-29
1994-03-29
Bryant, III, James E.
Pipes and tubular conduits
Distinct layers
Bonded to each other
138140, 138151, 138172, 138DIG6, 228143, F16L 914
Patent
active
052975878
ABSTRACT:
A 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 a 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.
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Bryant III James E.
ITT Corporation
Lewis J. Gordon
Seitter Robert P.
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