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Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform

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Abstract

Ti-6Al-4V titanium alloy weldments were prepared using conventional TIG and fast-frequency double-pulse TIG (FFDP TIG) waveforms. Arc shape, microstructure, and mechanical properties of weldments were investigated. The arc core area of the FFDP TIG shrinks gradually, and the weldment fusion zone (FZ) width and heat-affected zone (HAZ) width are reduced by 18.2% and 31.3%, respectively. The molten pool intensive stirring effect and the heat input reduction by FFDP TIG waveform resulted in the prior β grain size decreased by 55.6% and the refinement of martensite αʹ structures. Microhardness and tensile strength of FFDP TIG weldment were higher than that of conventional TIG; the tensile strength and elongation reached 98.4% and 65.6% of the base metal, respectively. The results show that the FFDP-TIG process improves the Ti-6Al-4V weldment microstructure and mechanical properties and can perform excellently in practical applications.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors are thankful to the editors and reviewers.

Funding

This work was supported by the Science and Technology Planning Project of Guangdong Province [grant numbers 2021B1515420006, 2021B1515120026], the National Natural Science Foundation of China [grant numbers U23A20625, U2141216, 52305357], the National Key Research and Development Program of China [grant number 2023YFB3407702], the Shenzhen Science and Technology Plan Project [grant numbers KJZD20230923114614029], the State Key Lab of Advanced Welding and Joining [grant number AWJ-23M03], the Guangzhou Science and Technology Plan Project [grant number 2023A04J1584], and the National Defense Key Laboratory Fund Project [grant number 61420052022WD011].

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510641, People’s Republic of China

    Yingwei Kuang, Jianjun Jia, Zeguang Zhu, Zixiao Gui, Jiyu Tian & Zhenmin Wang

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Zhenmin Wang

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  1. Yingwei Kuang
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The conceptualization and manuscript were conducted by Yingwei Kuang. The experiments were designed by Jianjun Jia, Zeguang Zhu, and Zixiao Gui. Jiyu Tian and Zhenmin Wang performed funding acquisition and manuscript review. All the authors took part in the paper.

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Kuang, Y., Jia, J., Zhu, Z. et al. Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform. Int J Adv Manuf Technol 130, 5269–5284 (2024). https://doi.org/10.1007/s00170-024-13067-z

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