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

• 崎野 良比呂

  大阪大学　接合科学研究所

• 佐野 雄二

  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

• 角谷 利恵

  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

• 金 裕哲

  大阪大学　接合科学研究所

書誌事項

タイトル別名

• Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor

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 10⁷ 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

  溶接学会論文集 29 (3), 146-153, 2011

  一般社団法人 溶接学会

キーワード

• Laser peening
• Fatigue strength
• Butt welded joint
• Residual stress
• Vickers hardness
• Stress relief annealing

詳細情報

• CRID: 1390001204726694528
• NII論文ID: 10030150775
• NII書誌ID: AN1005067X
• DOI: 10.2207/qjjws.29.146
• COI: 1:CAS:528:DC%2BC3MXhtF2it7jJ
• ISSN: 24348252
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可