Patent ID: 7635078

Claim:
A brazing method comprising: a) making a porous material consisting of metals or metal alloys, the metals or metal alloys comprising Ni, Cu, Ti, Al, Ag, or W, and being a soft metallic porous material, and the soft metallic porous material being made by sintering its metals or metallic alloy powders penetrated into a urethane; b) utilizing the soft metallic porous material made beforehand in the step of making a porous material in a brazing process, and utilizing the soft metallic porous material when the thickness of an opening for brazing between materials cannot be maintained constant or cannot be adjusted in a thickness range of less than 0.05 mm, and in which brazing process the metallic porous material made beforehand is inserted into the opening between the materials being brazed and reinforced by using the softness of the soft metallic porous material; and c) in the step of utilizing the soft metallic porous material in a brazing process, the metallic porous material, together with a solder held or added beforehand to the soft metallic porous material, is inserted under pressure into the opening between the materials being brazed by using the softness of the soft metallic porous material.