Patent ID: 6635360
Filing Date: 2003-10-21
Classification: B23K,B32B,C22C,F28F,Y10S,Y10T

Abstract:
An aluminum alloy brazing sheet for use in fluxless brazing in an inert gas atmosphere, said aluminum alloy brazing sheet comprising:a thin covering material layer; a core material layer; and an Alâ€”Si alloy brazing material layer interposed between said thin covering material layer and said core material layer, said thin covering material layer and said core material layer being comprised of aluminum alloys having a solidus temperature higher than a liquidus temperature of said Alâ€”Si alloy brazing material layer, herein said Alâ€”Si alloy brazing material layer, when subjected to a fluxless brazing process carried out in an inert gas atmosphere at a temperature between said liquidus temperature and said solidus temperature, is capable of melting while said thin covering material layer remains solid to prevent oxidation of the brazing material being melted down, and then, due to volumetric expansion, seeping through segregation portions of said thin covering material layer onto a surface of said thin covering material layer and spreading over the surface of said thin covering material layer to form an emerging surface free from oxidation film, thereby allowing the fluxless brazing with a joint partner material sheet.