INDUCTION BRAZING FOR DISSIMILAR METAL JOINING

Abstract

Dissimilar induction brazing is performed on 304 stainless steel and Aluminum 6061 with high frequency. Several fillers were tried to join but Zinc-Aluminum alloy was found more feasible. When Zinc-15% Aluminum alloy is used as a filler, perfect brazed joint is obtained. The brazed joint is then analysed by conducting various tests including shear tensile test on UTM where the maximum withstanding load was 2.5 to 3 KN and stress at maximum load was 68 to 100MPa. The brazed joints were cut into small samples, polished and then analysed on stereomicroscope, SEM and optical microscope. It is found that Aluminum base metal was slightly penetrated into Zn-15%Al filler metal because of the mutual solubility of zinc and aluminum. The effect of brazing time on the strength of the joint is analysed in this study. Hardness test analysis was done using micro Vickers hardness test on the polished surface of the brazed sample containing 2 interfaces with 2 base metals and a filler metal. When the brazed joint is tested on UTM in all the samples brittle fracture occurred.