Welding of pre-brazed diamond grits onto a substrate using nickel-based alloys

Key Words:MICROSTRUCTURE EVOLUTION; RESIDUAL-STRESSES; SHEAR-STRENGTH; RESISTANCE

Abstract:The diamond grits pre-brazed using an amorphous nickel (Ni)-based alloy were accurately fixed onto some positions on a steel substrate by resistance spot welding with a hot-pressing function. The amorphous Ni-based alloy thoroughly wetted and wrapped the diamond grits in the pre-brazing process. After the resistance spot welding, the pre-brazed diamond grits and steel substrate formed a strong metallurgical bonding under resistance heat and electrode pressure. The diamond grits welded by resistance spot welding maintained sharpness similar to that of regular diamond grits. The maximum tensile stress of welded diamond grits pre-brazed using amorphous alloy reached up to 0.43 GPa. The stress state was attributed to the presence of carbides of moderate magnitude between the bonded cladding and diamond grits. Grinding tests showed that the grinding performance of welded diamond grits pre-brazed using amorphous Ni-based alloy was better than that of welded diamond grits pre-brazed using crystalline Ni-based alloy.

Volume:39

Issue:2

Translation or Not:no