Impact of TIG Welding Parameters on the Microstructure and Properties of Ti-4Al-2V Welds

doi:10.3901/JME.260048

Abstract

Abstract: There is currently limited research on the factors influencing the welded microstructure and properties of Ti-4Al-2V titanium alloy under different welding parameters. To further broaden its application scope, it is essential to conduct relevant research. Research is conducted on Ti-4Al-2V titanium alloy welded joints prepared using various tungsten inert gas(TIG) welding parameters. A comparative analysis is made of the microstructural characteristics of different micro-zones within the heat-affected zone(HAZ) and the fusion zone(FZ). Combined with quasi-static nanoindentation and Vickers hardness tests, the influence of welding parameters on the microstructure of the welded joints is studied. Relationships between process parameters, welding microstructure, and properties are established. Results indicate that as welding heat input increases, the micro-zones within the HAZ are more significantly affected by the welding thermal cycle, leading to greater growth and deformation of the α-phase and coarser lamellar secondary α-phase. A larger temperature gradient in the FZ results in finer and more uniform lamellar secondary α-phase, and a higher average nanoindentation hardness in the FZ. The content and size of the secondary α-lamellae are the primary factors influencing the proportion of low-and high-angle grain boundaries. Under varying welding parameter conditions, the trends of change in nanoindentation hardness and Vickers hardness of the welded joints of Ti-4Al-2V titanium alloy are consistent, with the fully recrystallized zone in the HAZ having the highest average hardness. The basket-weave microstructure in the HAZ of the Ti-4Al-2V titanium alloy welded joint exhibits the highest average nanoindentation hardness, and obtaining this microstructure is more desirable during welding. The results can provide crucial technical references for the iterative optimization of TIG welding processes for Ti-4Al-2V titanium alloy.

Key words: Ti-4Al-2V, TIG welding, microstructure, grain boundary characteristics, nanoindentation

CLC Number:

TG457

CHEN Yao, LIU Xiao, ZHANG Zhendi, ZHANG Shanglin, GUO Nan, WU Jun. Impact of TIG Welding Parameters on the Microstructure and Properties of Ti-4Al-2V Welds[J]. Journal of Mechanical Engineering, 2026, 62(2): 207-217.

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