Method of making finned tubes
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United States of America Patent
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Feb 1, 2005
Issued Date -
N/A
app pub date -
Dec 16, 2003
filing date -
Jan 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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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.degree. C. and 470.degree. C. to produce a unitary structure which is then allowed to cool down at room temperature.
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