Abstract
To study the effect of brazing clearance and temperature on strength and microstructure, vacuum brazing of 316L stainless steel was carried out with BNi-2 nickel-based solder. Choose the different brazing clearance to be processed at 1070°C, analyzed the welding tissue by SEM and XRD, and found that hardness has been greatly improved to 664HV. The results showed that when the 316L stainless steel was brazed with BNi-2 filler metal at 1070°C, the structures of the welded joint were composed of FeNi3, Fe5C2, Cr5FeB3 metallic compounds and solid solutions. The microhardness of the welded joint by the center to both sides had a W-type distribution. When the width of the welded joint was 40μm, the microharedness of the center welded joint was lower than others, and shear strength of this clearance was the highest, about 300MPa.
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