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CHENG Guangfu, WANG Huiting, JI Shude, FANG Hongyuan. Optimizing of compressive stress region by local treatment technologies on Francis runner[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (8): 97-100.
Citation: CHENG Guangfu, WANG Huiting, JI Shude, FANG Hongyuan. Optimizing of compressive stress region by local treatment technologies on Francis runner[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (8): 97-100.
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Optimizing of compressive stress region by local treatment technologies on Francis runner

  • 1.

    State Key Laboratory of Hydro-power Equipment, Harbin Institute of Large Electrical Machinery, Harbin 150040, China

  • 2.

    Institute of Astronautical Technology, Shenyang Institute of Astronautical Engineering, Shenyang 110034, China

  • 3.

    State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

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  • Received Date: May 30, 2011
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    • Abstract
  • The existing of residual compressive stress increases the fatigue resistance of welding structures.The local compressive stress was realized around the fusion boundary in the Francis turbine runner by optimizing the welding process, where fracture could easily occur.And the influence of local heating and peening on the stress field in the fracture-easily-occurred region of runner was simulated and measured based on the real runner.The results indicate that the stress field in the fracture-easily-occurred region of runner can be regulated and controlled by local heating and peening processes.And the local compressive stress region was optimized.The value of residual compressive stress in the fracture-easily-occurred region of runner was further improved, and high compressive stress region was formed, especially, the compressive stress region was expanded.These processes can promote the realization of local compressive stress in the fracture-easily-occurred region of Francis runner and effectively enhance the fatigue resistance of the runner.
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