レーザピーニングによる突合せ溶接継手の疲労強度向上とその主要因 Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor

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著者

    • 佐野 雄二 SANO Yuji
    • 東芝電力システム社 電力・社会システム技術研究センター Power and Industrial Systems Research and Development Center, Toshiba Corporation
    • 角谷 利恵 SUMIYA Rie
    • 東芝電力システム社 電力・社会システム技術研究センター Power and Industrial Systems Research and Development Center, Toshiba Corporation

抄録

Laser peening which introduces compressive residual stress on surface is effective in extending fatigue lives of welded components, because tensile residual stress after welding is one of the most important factors reducing the fatigue lives. Steels for structures are widely used for bridges, buildings, etc., however the effects of laser peening on steels for structures are not well established. In this study, the residual stress, Vickers hardness and fatigue strength of the toe of butt welded joints pretreated by laser peening were examined and compared to those without laser peening. These results were further compared to those of annealed specimens in order to clarify the main factor of improving the fatigue strength. Main results are summarized as follows. 1) Large and deep compressive residual stress was generated around the toe of the butt welded joints by laser peening. 2) Vickers hardness also increased by laser peening but the incremental level was small. 3) Fatigue strength at 10<sup>7</sup> cycles of the butt welded joints became much higher by laser peening. 4) It can be considered that the main factor of improving fatigue strength is the generation of compressive residual stress.

収録刊行物

  • 溶接学会論文集 : quarterly journal of the Japan Welding Society

    溶接学会論文集 : quarterly journal of the Japan Welding Society 29(3), 146-153, 2011-12-31

    一般社団法人 溶接学会

参考文献:  16件中 1-16件 を表示

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各種コード

  • NII論文ID(NAID)
    10030150775
  • NII書誌ID(NCID)
    AN1005067X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    02884771
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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