Abstract: This work aims to optimize the argon arc welding process of TC4 titanium alloy by numerical method, analyse the microstructure features and mechanical properties of the welding joint under the optimum technological. The modeling results were validated with the verification experiment. The results show that the base metal of the welding joint can be fully penetrated with the voltage of 20 V, the current of 130 A, and the welding speed of 3 mm/s by argon arc welding of 8 mm plate of TC4 titanium alloy, well-formed and defect-free welded joints can be obtained under these process parameters combined with experimental verification. Different microstructure states that can be formed at different cooling rates, the cooling rate in the fusion zone can reach 788 ℃/s, mainly columnar crystals and a few equiaxed crystals, and a large number of needle-like α′ martensite formed in the crystal. And the average hardness is 390.96HV, which is 1.11 times that of the base metal. The cooling rate of the coarse-grained zone in the heat-affected zone reaches 475 ℃/s, there are lamellar α phase precipitated in the β grains and the average hardness is 328.19HV, which is lower than that of the base metal. The cooling rate of the fine-grained zone in the heat-affected zone reaches 67 ℃/s, the grain size is smaller than that in the coarse-grained zone and a very small amount of martensite is formed, the average hardness is 363.69HV. The conclusions may provide a design reference of welding technology for TC4 titanium alloy.
方静, 祁文军, 胡国玉. 8 mm中厚板TC4钛合金TIG焊数值模拟及实验研究[J]. 材料导报, 2023, 37(22): 22030018-6.
FANG Jing, QI Wenjun, HU Guoyu. Numerical Simulation and Experimental Research on TIG Welding of 8 mm Medium and Heavy Plate TC4 Titanium Alloy. Materials Reports, 2023, 37(22): 22030018-6.
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2023, Vol. 37 
