Thin film brazing of aluminum shapes

Details Thin film brazing of aluminum shapes Thin film brazing of aluminum shapes

B - Operations, Transporting

23

K

B23K 1/00 (2006.01) F28D 1/047 (2006.01) F28D 1/053 (2006.01) F28F 1/12 (2006.01) F28F 9/04 (2006.01)

Patent

CA 2159247

An improved method of brazing of two unclad aluminum shapes, particularly for automotive heat exchangers, which brazing joint does not leave a physically apparent layer of brazing material and which effects a stronger, sounder autogenous joint. A thin film of aluminum eutectic forming material (Si, Al-Si or Al-Zn) is deposited onto a zone of at least one of the shapes to be brazed or joined. The shapes are placed in joining relationship to form an assembly with a joint at the zone. The assembly is heated to a temperature to diffuse the eutectic forming material into the aluminum members to form a sacrificial bond between the shapes at the joining zone. It is desirable that at least one of the unclad aluminum shapes to be joined is extruded tubing having a precise diametrical configuration and said film is deposited as a physically vapor deposited layer in a thickness range of 1- 50 microns.

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