On the Mechanical Performance of Novel Filler Material for Sinter-Brazing PM Steels Components and Dissimilar steels

摘要

When liquid phase is used for bonding, it is trying to combine high productivity, joint strength and geometry flexibility, being possible to expand its range of application to production of dissimilar metal joints. Shear strength is one of the most critical aspects of welds, since it determines the lifetime of the assembly. The reliability of the weld itself results from the design of the filler material. Consequently, the properties of the promoted liquid phase and the liquid-solid interaction play a key role in the joining process. In this paper, a B-free filler material based on the Cu-Fe-Ni-Si alloying system accomplishes PM-PM and dissimilar (cast-sintered) steel sinter-brazed joints, and it is compared to commercial filler grades. The assembly was tested with tensile shear stress testing and the cross-section of the weld bead was prepared for microscopy inspection, together with the microhardness profile across the different phases detected on the joint.