Flux composition for aluminum brazing
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United States of America Patent
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Sep 19, 1995
Grant Date -
N/A
app pub date -
Feb 28, 1994
filing date -
Feb 28, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved flux composition is provided which is formulated for use in the brazing of aluminum alloy components, such as in the assembly of brazed heat exchanger units used in automotive applications. The flux composition is in a concentrated form, permitting its selective application to the joint surfaces of a heat exchanger's subcomponents, and contains a flux material which consists essentially of potassium tetrafluoroaluminate, a carrier system such as a glycerol-ethylene glycol system, a binder, and a liquid medium such as water. Most preferably, the potassium tetrafluoroaluminate constitutes at least about 96 percent of the flux material, and the binder is xanthan which substantially prevents the flux composition from separating during storage. The flux composition does not contain potassium aluminum fluoride. The flux composition also makes possible a method for forming a brazed heat exchanger assembly, in which the use of a clad brazing stock material for the components of the heat exchanger can be minimized or eliminated through the use of a brazing alloy preform.
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