Method of making finned tubes

Details Method of making finned tubes Method of making finned tubes

2005-02-01

2005-02-01

Edmondson, Lynne R. (Department: 1725)

Metal fusion bonding

Process

Plural joints

C228S129000, C228S223000, C228S262410, C228S262420, C228S262510, C228S146000, C148S023000, C428S659000

Reexamination Certificate

active

06848609

ABSTRACT:
In a method of making finned tubes as components of air-cooled systems or condensers, a sheet metal strip of aluminum is first shaped into a waved finned structure with plural fins in parallel relationship and arched ends for connecting the fins, thereby defining crests on opposite ends of the finned structure. A fluxing agent of cesium-aluminum tetrafluoride is applied in lines onto the crests on at least one of the ends of the finned structure. The finned structure is then placed upon a broad side of a flat steel tube coated with a zinc/aluminum alloy. The finned structure and the flat tube are subsequently joined in a brazing furnace in the presence of an inert gas at a temperature between 370° C. and 470° C. to produce a unitary structure which is then allowed to cool down at room temperature.

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