Patent ID: 6753094
Filing Date: 2004-06-22
Classification: B23K,Y10T

Abstract:
A coiled composite sheet material for brazing, the composite sheet material having a structure comprising a metal substrate, selected from the group consisting of an aluminium substrate and an aluminium alloy substrate on at least one side coupled to a copolymer carrier layer having a thickness of at most 150 &mgr;m and comprising copolymer of ethylene and acrylic acid as a carrier filled with a brazing flux material,said brazing flux material comprising at least one member of the group consisting of a fluoride flux and a chloride flux in an amount sufficient to achieve brazing, and the brazing flux material has an average particle size dimension of less than 5 &mgr;m and the amount of brazing flux material per side of the composite sheet material is less than 5 gram/m2 and is arranged substantially homogeneously throughout the copolymer carrier layer and the thickness of the filled copolymer carrier layer is substantially the same over the whole surface area covered.