Abstract: A brazing method is provided for brazing a metallic material for brazing to another metallic material. The metallic material for brazing includes a base material portion made of copper or a copper alloy containing chrome by a predetermined amount, and a metallic film portion made of a material having a melting point lower than a heating temperature in brazing, and provided on the surface of the base material portion. The brazing method includes a step of assembling the metallic material for brazing and the another metallic material to form an assembly, a step of heating and brazing the assembly, in which the metallic film portion is melted to diffuse chrome into a surface of the metallic material for brazing, and a step of forming a chrome oxide film by using the chrome diffused into the surface of the metallic material for brazing in atmosphere after the brazing step.

Abstract: The invention relates to a method and an apparatus for positioning solder or braze material on the fin material to be used in a heat exchanger, as a radiator for vehicle, in which method the fin material, as a corrugated strip, is partly covered with solder or braze material. According to the invention the fin material (8) is transferred to the vicinity of a cladding device (1,2) so that when the fin material (8) is passed by the cladding device (1,2), the fin material (8) is cladded by solder or braze material (11) at least in one side of the fin material (8) essentially at the curved parts (10) of the fin material (8).

Abstract: Alloys for brazing used in heat exchangers, particularly in radiators. The alloys contain 14-31% by weight zinc, 0.1-15% by weight iron, 0.001-0.05% by weight phosphorus and 0-0.09% by weight arsenic, the balance being copper and incidental impurities.