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SHI Mingxiao, ZHAO Jian, CHEN Shujin, LI Tianhui. Effects of beam-offset on microstructure and properties of laser welded Nb/304 SS joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(3): 41-44.
Citation: SHI Mingxiao, ZHAO Jian, CHEN Shujin, LI Tianhui. Effects of beam-offset on microstructure and properties of laser welded Nb/304 SS joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(3): 41-44.
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Effects of beam-offset on microstructure and properties of laser welded Nb/304 SS joint

  • 1.

    School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

  • 2.

    School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

  • 3.

    Experiment base, North hua an industrial group co., LTD, Qiqihaer 161046, China

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  • Received Date: March 16, 2016
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    • Abstract
  • In this work, the Nb/304 SS joint was welded by laser welding. The joint fractured immediately due to continuously distributed Fe2Nb intermetallic compounds when the laser was directed to the Nb/steel interface. In order to solve the problem, the laser beam-offset welding procedure was proposed. The amount of melted niobium was reduced by the laser offset effect. Finally, the formation of Fe2Nb intermetallic compounds was controlled. The results showed that laser beam-offset welding was an ideal way to control the joint crack which occurred in laser centered welding condition. The joint microstructure was mainly consisted of γ austenite phase and a certain amount of Fe2Nb intermetallic compounds with little δ ferrite phase. The tensile strength of the joint was 221 MPa, the fracture occurred in the Fe2Nb intermetallic compounds layer. The highest microhardness existed in Fe2Nb intermetallic compounds layer with a value of 1 143 HV.
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    • References (8)
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