Method of joining steel tubes with aluminum ribs
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United States of America Patent
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Apr 6, 2004
Issued Date -
N/A
app pub date -
Jul 22, 2002
filing date -
Jan 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for joining a steel tube with an aluminum rib, a zinc-aluminum alloy layer, having an aluminum content of 0.5% by wt. to 20% by wt., is applied to the surface of the steel tube or the aluminum rib, and then a fluxing agent in the form of cesium-aluminum tetrafluoride is applied between the steel tube and the aluminum rib at room temperature before or during the mechanical contact of the aluminum rib with the steel tube. The steel tube provided with the aluminum rib is then heated to a soldering temperature of between 370.degree. C. and 470.degree. C. and subjected to room temperature to cool down.
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