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XIA Xiaowei, WU Jiefeng, LIU Zhihong, SHEN Xu. Study on non-uniform properties of 316L thick plate joint using electron beam welding in port stub of vacuum vessel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(9): 53-58. DOI: 10.12073/j.hjxb.2019400235
Citation: XIA Xiaowei, WU Jiefeng, LIU Zhihong, SHEN Xu. Study on non-uniform properties of 316L thick plate joint using electron beam welding in port stub of vacuum vessel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(9): 53-58. DOI: 10.12073/j.hjxb.2019400235
shu

Study on non-uniform properties of 316L thick plate joint using electron beam welding in port stub of vacuum vessel

  • 1.

    Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230031, China;University of Science and Technology of China, Hefei 230022, China

  • 2.

    Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230031, China;Baosheng Group of China, Yangzhou 225800, China

  • 3.

    Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230031, China

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  • Received Date: April 01, 2018
    Graphical Abstract
    • Abstract
  • The vacuum vessel is the core component of the China future fusion engineering test reactor. Port stub is a part of vacuum vessel and it is welded by electron beam welding (EBW), which has capability to weld more than 50 mm thickness stainless steel by a single pass. In order to explore non-uniform properties of EB welded joint, beam oscillation was applied during the welding process and the microstructure and microhardness of 50 mm 316L austenitic stainless steel welded joint were analyzed. The results showed that the weld microstructure was composed of austenite and ferrite. From the upper layer near the center line of the weld to the lower layer, the microstructure changed from coarse lathy/skeletal ferrite to more close-packed skeletal ferrite and equiaxed gain. Welded joints with beam oscillation appeared equiaxed gain earlier in the weld thickness direction. Beam oscillation can improve the quality of the welds surface forming. The microhardness of the welds gradually increased from the upper layer to the lower layer.
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    • References (15)
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