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Effect of Oscillating Patterns on the Weld Formation, Microstructure, and Tensile Properties of 1.7-mm Recrystallized Niobium Sheets

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Abstract

The beam oscillation was considered to improve the weld formation, microstructure, and mechanical properties of the equator welds in the superconducting radiofrequency cavities. In this study, electron beam welding (EBW) of the 1.7-mm recrystallized niobium sheets was done with various beam oscillation patterns (sinusoidal, circular, and infinity). The results show that the weld formation is optimum when welding with circular oscillation. The grains in the fusion zone and heat-affected zone are not significantly refined through beam oscillation. Texture in the weld and bottom surface shows an anisotropy of the weld with circular or infinity oscillation and a possibility of electron emission of the weld with sinusoidal or circular oscillation. Moreover, the joint with circular oscillation has the optimum tensile strength when tensile tested at 77 K, and the plasticity is the poorest for the joint with infinity oscillation.

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Acknowledgements

This work is funded by the Anhui Provincial Key Research and Development Plan (Grant No. 202104a05020079). The authors deeply appreciate the grant and financial support. The authors are also thankful to the Hefei Jvneng Electrio Physics High-tech Development Co. for the provision of welding equipment.

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Authors and Affiliations

  1. Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China

    Jia Tao, Jiefeng Wu, Zhihong Liu & Jianguo Ma

  2. Science Island Branch, University of Science and Technology of China, Hefei, 230026, China

    Jia Tao

  3. Anhui Province Key Laboratory of Special Welding Technology, Huainan, 232000, China

    Jiefeng Wu, Zhihong Liu, Jianguo Ma & Zhenfei Liu

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  1. Jia Tao
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Tao, J., Wu, J., Liu, Z. et al. Effect of Oscillating Patterns on the Weld Formation, Microstructure, and Tensile Properties of 1.7-mm Recrystallized Niobium Sheets. Trans Indian Inst Met 76, 1291–1301 (2023). https://doi.org/10.1007/s12666-022-02798-w

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