Microstructure and Properties of Resistance Spot Welded Joints of Ni Interlayer Magnesium/Titanium Dissimilar Materials
TAN Qinwen1,2, DENG Lipeng1,2,*, Yi Runhua1,2, CHENG Donghai2, LI Dongyang2
1 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Aviation University, Nanchang 330063, China 2 School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
Abstract: A three-phase secondary rectifier resistance welding machine was used to conduct resistance spot welding of magnesium/titanium dissimilar materials, with 20 μm pure Ni foil added as the intermediate layer. The influence of welding process parameters, including welding current (I), welding time (t) and welding pressure (P) on the formation and mechanical properties of spot welded joints was studied, and the regulation and control effect of Ni on the interface structure of spot welded joints was investigated. The results show that within a certain range, the thickness of the interface compound layer, effective bearing area and bearing capacity of the joint increased, as the heat input increased, and the welded joints with good appearance were formed. Under the condition of I=20.7 kA, t=20 cyc, and P=7.63 kN, the maximum tensile-shear load of the joint reached 5.249 kN. The interface composition of magnesium/titanium spot welded joints from the magnesium side to the titanium side were α-Mg, (α-Mg+Mg2Ni) eutectic structure, Ti2Ni interface layer, and pure Ti. The interface layer structure presented a mountain-shaped distribution characteristic with a thick center and thin sides.
谭钦文, 邓黎鹏, 易润华, 程东海, 李东阳. Ni中间层镁/钛异种材料电阻点焊接头组织与性能[J]. 材料导报, 2023, 37(7): 21090077-4.
TAN Qinwen, DENG Lipeng, Yi Runhua, CHENG Donghai, LI Dongyang. Microstructure and Properties of Resistance Spot Welded Joints of Ni Interlayer Magnesium/Titanium Dissimilar Materials. Materials Reports, 2023, 37(7): 21090077-4.
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2023, Vol. 37 
