BRAZING METHOD FOR ALUMINUM MATERIAL

摘要

PURPOSE:To provide the brazing method which can prevent flux from remaining on the surface of a brazed aluminum article and improves the appearance and surface treatability as the brazing method for aluminum materials which brazes the aluminum materials in an atmosphere contg. the gaseous flux. CONSTITUTION:The moisture concn. in a brazing furnace is adjusted to <=60ppm and aluminum joining members are preheated for 5 to 30 minutes at 300 to 570 deg.C in this atmosphere, by which the water adsorbed on the surfaces of the aluminum joining members is removed. The gaseous flux is then supplied into the furnace so that the gaseous flux concn. attains <=200ppm. A brazing filler metal for joining is melted in the gaseous flux-contg. atmosphere and the brazing is executed.