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DU Bing, SUN Fenglian, XU Yujun, LI Xiaoyu, LÜ Xiaochun, QIN Jian. Effect of welding methods on impact toughness of ultra-low carbon martensitic stainless steel welding wire deposited metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(8): 1-4.
Citation: DU Bing, SUN Fenglian, XU Yujun, LI Xiaoyu, LÜ Xiaochun, QIN Jian. Effect of welding methods on impact toughness of ultra-low carbon martensitic stainless steel welding wire deposited metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(8): 1-4.
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Effect of welding methods on impact toughness of ultra-low carbon martensitic stainless steel welding wire deposited metal

  • 1.

    College of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150001, China;Harbin Welding Institute, Harbin 150028, China

  • 2.

    College of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150001, China

  • 3.

    Harbin Welding Institute, Harbin 150028, China

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  • Received Date: April 26, 2014
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    • Abstract
  • As for the low impact toughness of weld metal for large hydro-turbine runner, effect of welding methods and gas content on impact toughness of ultra-low carbon martensitic stainless steel welding wire deposited metal is investigated. The results show that the Laser-MIG hybrid welding in addition to TIG welding can greatly improve the impact toughness. TIG can be used for weld repairs of stainless steel runner. Laser-MIG welding could promete the using in the group welding of laminas, vanes and band. The impact toughness decreased with the increase of C, [O] and [N] content of deposited metal, and [O] is the major factor. Spherical oxide inclusion can generate crack in deposited metal with high [O] condition, and decrease crack initiation and expansion energy.
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