Vapor phase brazing method of al or al alloys

Details Vapor phase brazing method of al or al alloys Vapor phase brazing method of al or al alloys

B - Operations, Transporting

23

K

113/86

B23K 1/015 (2006.01)

Patent

CA 2006659

ABSTRACT The present invention relates to a brazing method when join- ing an assembly comprising Al or Al alloy components and provides a vapor phase brazing method not necessitating a process to coat directly onto the assembly to be joined with flux. It is characterized in that, when brazing Al or Al alloy components intervening a brazing material, these components are brazed in a nonoxidative atmosphere, the vapor of potassium fluoroaluminate complex existing therein. This vapor adheres to the assembly in extremely small amount and in uniform state and destroys the oxidized film of Al on the surface thereof, so that the wetting of brazing material is promoted, the brazing material flows evenly and the uniform fillet is formed at the joining point of assembly. In addition, there are advantages that the consumption of flux is low to be economical, that the brazability of Mg-containing materials is enhanced, that the surface of joined product after the brazing is clean, and the like.

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