公开(公告)号：WO1990006204A1

公开(公告)日：1990-06-14

申请号：PCT/JP1989001198

申请日：1989-11-27

Applicant: FURUKAWA ALUMINUM CO., LTD ,  YAMAGUCHI, Motoyoshi ,  KOYAMA, Hitoshi

Inventor： FURUKAWA ALUMINUM CO., LTD

IPC: B23K01/00

CPC classification number: B23K1/015 ,  B23K1/19 ,  B23K35/3605 ,  B23K35/38

Abstract: This invention relates to a brazing method for bonding an assembly made of Al or an Al alloy, and more particularly to a gaseous phase brazing method which does not need the step of applying directly a flux to the assembly to be bonded. The present invention is characterized in that when Al or an Al alloy member is brazed through a brazing material, these members are brazed in a non-oxidizing atmosphere where a vapor of potassium fluoroaluminate complex exists. This vapor attaches in an extremely small quantity and uniformly to the assembly and destroys the Al oxide film on the surface. Accordingly, it promotes wetting of the brazing material, causes the brazing material to flow uniformly and forms uniform fillets at the bonding portion of the assembly. Furthermore, the consumed amount of the flux is small and economical, brazability of an Mg-containing material can be improved and the surface of the bonded article after brazing is clean and beautiful.