Pipes and tubular conduits – Spirally seamed
Patent
1993-02-26
1996-09-10
Bryant, III, James E.
Pipes and tubular conduits
Spirally seamed
138137, 138140, 138142, 138143, 138153, 138DIG6, F16L 914
Patent
active
055536409
ABSTRACT:
A multi-layer metal tube consists of a flat steel band having a soldering layer connected to at least one side of the steel band. The soldering layer consists of a copper alloy having a melting point below 1020.degree.. The tube is produced by deforming the flat steel band into a tubular shape by winding or cylindrically rolling and by subsequently soldering the steel band to form the multi-layer metal tube. The soldering step prevents leaks as well as corrosion. In the corresponding method for manufacturing the multi-layer tubes the steel band in a first step is electrolytically degreased and activated in a nickel flash bath or in a copper pickling bath. Subsequently, the steel band is coated with the copper alloy which contains tin, zinc, or silver in order to reduce the melting point. After completion of the winding step or rolling step, the multi-layer tube can be coated with an additional corrosion-preventing layer.
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Ferenczy Nikolaus
Junkers Dieter
Bryant III James E.
Hille & Muller
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