Nb/Nb55Ti welding process test at the joints of tubes and flanges in superconducting cavities

TAO Jia; WU Jiefeng; LIU Zhihong; MA Jianguo; LIU Zhenfei

doi:10.12073/j.hjxb.20201118002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(3): 77-84. > DOI: 10.12073/j.hjxb.20201118002

TAO Jia, WU Jiefeng, LIU Zhihong, MA Jianguo, LIU Zhenfei. Nb/Nb55Ti welding process test at the joints of tubes and flanges in superconducting cavities[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(3): 77-84. DOI: 10.12073/j.hjxb.20201118002

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Nb/Nb55Ti welding process test at the joints of tubes and flanges in superconducting cavities

TAO Jia^{1, 2,},
WU Jiefeng^1, ,,
LIU Zhihong^{1, 3},
MA Jianguo^{1, 3},
LIU Zhenfei³

1.
Institute of plasma physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
2.
University of Science and Technology of China, Hefei 230026, China
3.
Anhui Province Key Laboratory of Special Welding Technology, Huainan 232000, China

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Received Date: November 17, 2020
Available Online: April 24, 2021

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Abstract

Abstract

The superconducting cavity is the core component of the particle accelerator. At present, the welding research of superconducting cavity at home and abroad is mainly focused on the pure niobium butt joints between half cells. There are few studies on the welding between the tube and the flange of the superconducting cavity. In order to explore the welding process of dissimilar materials at this joint, the L-shaped joint assembled vertically by the Nb plate and the Nb55Ti plate was used to simulate the joint between the tube and the flange during the electron beam welding process of superconductingcavity. The tests were carried out under beam currents of 8, 12 and 20 mA respectively. The macroscopic morphology, microstructure, chemical composition and microhardness of the joints under different beam current parameters were compared and analyzed after welding. The results showed that the weld was formed better when the beam current was 12 mA, and the grain growth in the HAZ on the Nb sidewas more obvious when the beam current was high. What’s more, the epitaxial growth of grains at the fusion boundary appeared in 3 groups of joints. As the welding current increased, coarse columnar crystals appeared near the fusion line. When the heat input was large, the liquid metal in the welding pool was fully mixed, which could be improved macrosegregation in the weld. The microhardness of the heat-affected zone on the Nb side decreased significantly after welding.
- superconducting cavity,
- electron beam welding,
- epitaxial growth,
- macrosegregation,
- welding of dissimilar materials

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Hirotaka Shimizu, Takeshi Dohmae, Masato Egi, et al. Fabrication and evaluation of superconducting single-cell cavities manufactured using various materials and methods[J]. IEEE Transactions on Applied Superconductivity, 2017, 27(7): 3500714.

Singer W. Fabrication of elliptical SRF cavities[J]. Superconductor Science and Technology, 2017, 30(3): 033001. doi: 10.1088/1361-6668/30/3/033001

Cantergiani E, Atieh S, Leaux F, et al. Niobium superconducting rf cavity fabrication by electrohydraulic forming[J]. Physical Review Accelerators and Beams, 2016, 19(11): 114703.

Bieler T R, Wright N T, Pourboghrat F, et al. Physical and mechanical metallurgy of high purity Nb for accelerator cavities[J]. Physical Review Special Topics-Accelerators and Beams, 2010, 13(3): 031002.

Balachandran S, Elwell R, Kang D, et al. Nb tubes for seamless SRF cavities[J]. IEEE Transactions on Applied Superconductivity, 2013, 23(3): 7100904.

Cooley L D, Burk D, Cooper C, et al. Impact of forming, welding, and electropolishing on pitting and the surface finish of SRF cavity niobium[J]. IEEE Transactions on Applied Superconductivity, 2011, 21(3): 2609 − 2614.

Zheng Yongjian, Zhou Lian, Jie Wanqi, et al. Hydrogenation and dehydrogenation analysis for Nb47Ti bars[J]. Rare Metal Materials and Engineering, 2014, 43(11): 2627 − 2630. doi: 10.1016/S1875-5372(15)60015-7

沈立华, 胡革全, 刘彦昌, 等. 超导用Nb55Ti饼材热处理工艺研究[J]. 热加工工艺, 2019, 48(16): 159 − 161.

Shen Lihua, Hu Gequan, Liu Yanchang, et al. Study on heat treatment process of Nb55Ti discs for superconductivity[J]. Hot Working Technology, 2019, 48(16): 159 − 161.

Jung Y, Hyun M, Joung M. RRR characteristics for SRF cavities[J]. Journal of the Korean Physical Society, 2015, 67(8): 1319 − 1323. doi: 10.3938/jkps.67.1319

Jung Y, Joung M. RRR characteristics of niobium along the welding directions for SRF cavities[J]. Journal of the Korean Physical Society, 2016, 69(6): 984 − 988.

Baars D, Jiang H, Bieler T, et al. Crystal orientations near welds in high RRR niobium with very large grains[J]. IEEE Transactions on Applied Superconductivity, 2007, 17(2): 1295 − 1298.

Wu G, Dhanaraj N, Cooley L, et al. Tensile tests of niobium material for SRF cavities[J]. AIP Conference Proceedings, 2010, 218: 857 − 862.

张弘宇, 李中泉, 屈化民, 等. 薄铌板电子束焊接工艺研究[J]. 中国机械工程, 2015, 26(17): 2314 − 2317. doi: 10.3969/j.issn.1004-132X.2015.17.007

Zhang Hongyu, Li Zhongquan, Qu Huamin, et al. Study on electron beam welding of thin niobium plates[J]. China Mechanical Engineering, 2015, 26(17): 2314 − 2317. doi: 10.3969/j.issn.1004-132X.2015.17.007

夏小维, 吴杰峰, 刘志宏, 等. 真空室窗口领圈316L厚板电子束焊接接头不均匀性[J]. 焊接学报, 2019, 40(9): 53 − 58.

Xia Xiaowei, Wu Jiefeng, Liu Zhihong, et al. Study on non-uniform properties of 316L thick plate joint using electron beam welding in port stub of vaccum vessel[J]. Transactions of the China Welding Institution, 2019, 40(9): 53 − 58.

Lee C M, Ju C P, Lin J C. Structure-property relationship of cast Ti-Nb alloys[J]. Journal of Oral Rehabilitation, 2010, 29(4): 314 − 322.

廖际常. 烧结过程中铌的晶粒长大[J]. 稀有金属快报, 2006(4): 41 − 42.

Liao Jichang. Grain growth of niobium during sintering process[J]. Rare Metals Letters, 2006(4): 41 − 42.

Saadati M, Nobarzad A K E, Jahazi M. On the hot cracking of HSLA steel welds: Role of epitaxial growth and HAZ grain size[J]. Journal of Manufacturing Processes, 2019, 41: 242 − 251. doi: 10.1016/j.jmapro.2019.03.032

Wan Xiaojun, Wu Changyi, Tan Chaogui, et al. Structure stability and elastic properties of β type Ti-X(X=Nb, Mo) alloys from first-principles calculations[J]. Rare Metal Materials and Engineering, 2014, 43(3): 553 − 558. doi: 10.1016/S1875-5372(14)60075-8

Zhao S, Wang M, Kou S, et al. Microstructures and mechanical properties of electron beam welded CuCrZr/Inconel/316L tube-to-tube junctions for WEST project[J]. Fusion Engineering and Design, 2020, 151: 111384. doi: 10.1016/j.fusengdes.2019.111384

Soysal T, Kou S, Tat D, et al. Macrosegregation in dissimilar-metal fusion welding[J]. Acta Materialia, 2016, 110: 149 − 160. doi: 10.1016/j.actamat.2016.03.004

李思莹, 程军, 于振涛, 等. Nb含量对生物医用Ti-Nb基合金力学性能与断口形貌的影响[J]. 西安文理学院学报(自然科学版), 2017, 20(3): 94 − 97.

Li Siying, Cheng Jun, Yu Zhentao, et al. The Effect of Nb content on the mechanical properties and fracture morphology of biomedical Ti-Nb based alloys[J]. Journal of Xi’an University(Nature Science Edition), 2017, 20(3): 94 − 97.

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