JPS5770083A - Brazing method - Google Patents

Abstract

PURPOSE: To prevent deformation of metallic products by the thermal expansion of brazing by providing parts which absorb thermal expansion length to jigs used in brazing metallic materials of a large coefft. of thermal expansion and small high- temp. strength.

CONSTITUTION: Fins 1 are brazed to tubes 3 of a heat exchanger of a large coefft. of thermal expansion and small high-temp. strength such as Al by using the jigs made of heat resistant materials such as stainless steel by connecting an upper beam 8 and a lower beam 5 by means of stanchions 6b. In this case the stanchions 6b of the jigs penetrate through the beam 8 and are made longer by (L₂ + the thickness δ of the beam 8) than the prescribed length L₁ of the heat exchanger product, and auxiliary stanchions 11 are put thereon in the positions of the extended parts L₂. At the time of brazing the fins 1 to the tubes 3, the contact surfaces of the beam 8 and the tubes 3 assume the same behavior as that of the expansion of the heat exchanger and since the heat exchanger does not receive compressive load from the beam 5 and the beam 8, the deformation of the heat exchanger does not occur.

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