چكيده به لاتين
Due to their very low density, magnesium and aluminum are considered light metals. The bonding of these two metals in the structures through fusion welding is accompanied by challenges such as the formation of intermetallic compounds in the form of thick and continuous layers in the joint. The process of friction-stirring welding for jointing Dissimilar metals such as aluminum and magnesium is proposed. In this research, the effect of the middle layer of pure zinc and the change of the pin tool parameter on the point contact of sheets of pure magnesium and aluminous with magnesium on top were investigated.The velocity of 1600 rpm, welding time for 45 seconds, triangular and conical pins, and the middle layer of pure zinc sheet with three thicknesses of 70, 100 and 130 μm were studied. Microstructural studies showed that the welding samples with triangular pins had better mixing, higher tensile strength and lower MgZn2 intermetallic compound than those with conical pins. By decreasing the thickness of the intermediate layer, the probability of forming a MgZn2 intermetallic compound is lower, and in the interconnection zone, the freezing and etiquette structures of aluminum, magnesium, and zinc have been created that in a sample welded with 70 μm triangular pin, the intermetallic compound MgZn2 in the joint Connection failed to create. The weld strength increased with an intermediate layer so that in a non-interlayer sample, a strength of 35 N/mm2; in cone-welded samples, a maximum strength of 75 N/mm2; and the highest strength in a triangular pin with the thickness of the middle layer of 70 micrometers, equal to 90 N/mm2 had been achieved.
