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Development of methods for prediction and control of welding stress and deformation besed on concept of inherent strain as their essential source

Research Project

Project/Area Number 03302037
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 船舶構造・建造
Research InstitutionOsaka University

Principal Investigator

UEDA Yukio  Osaka Univ., Welding Research Institute, Professor, 溶接工学研究所, 教授 (30029037)

Co-Investigator(Kenkyū-buntansha) NAKACHO Keiji  Osaka Univ., Welding Research Institute, Assist.Professor, 溶接工学研究所, 助手 (10112070)
MURAKAWA Hidekazu  Osaka Univ., Welding Research Institute, Assoc.Professor, 溶接工学研究所, 助教授 (60166270)
TOYOSADA Masahiro  Kyushu Univ., Faculty of Engineering, Professor, 工学部, 教授 (30188817)
MIYAKE Shoji  Osaka Univ., Welding Research Institute, Professor, 溶接工学研究所, 教授 (40029286)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1993: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1992: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1991: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsWelding Residual Stress / Inherent Strain / Function Representation / Fillet Welding / Finite Element Method / Toe of Weld / Prediction and Control / 溶接 / 熱加工 / 溶接変形 / 残留応力 / 固有歪 / 突合せ溶接 / 横収縮 / 会合法 / 初期応力 / 塑性歪み / 局部加熱
Research Abstract

To promote the automation of shipbuilding process, the prediction and the control of the welding deformation are very important problems to be solved. Also, to achieve highly reliable estimation of the safety of ships against the fatigue damage, the quantitative estimation of welding residual stress is necessary. For establishing a consistent view on the welding residual stress and the deformation, the problem should be examined on the bases of the concept of inherent strain, which is considered to be the source of both the residual stress and the deformation. For the quantitative comparison to identify the most influential factor, numerical methods such as the FEM is a very powerful tool.
Thus, a FEM code was developed in the first year of this research program for the prediction and the control of the welding deformation. The characteristics of the inherent strain and the residual stress were clarified. Further, the effects of tack welding pitch and the type of tab-plate are investigated based on the FEM simulation.
In the following two years, the effects of root gap due to the cutting error and the residual stress in the steel plate are examined. Through this study, it is found that these factors are more influential than the tack weld and the tab. Thus, it is necessary to control them to reduce the welding deformation.
To estimate the residual stress in butt weld and fillet weld with small number of measuring points, a new measuring method was developed and its validity was examined through experiments. The proposed method is based on the concept of inherent strain and the fact that the distribution of the inherent strain can be accurately described as a function involving small number of parameters.

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 上田 幸雄: "T型継手の固有ひずみによる溶接残留応力推定法の実験的検証 -溶接残留応力の生成源を用いた残留応力推定法(第4報)-" 溶接学会論文集. 11. 327-333 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 上田 幸雄: "ビ-ドオンプレート溶接における3次元残留応力のTL_yL_z法およびT法による測定" 溶接学会論文集. 11. 555-562 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda: "Three dimensional Numerical Simulation of Various thermo-Mechanical Processes by FEM (Report III)" Transactions of JWRI. 22. 127-134 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda: "Simulation of Welding Deformation for Accurate Ship Assembling (Report II)" Transactions of JWRI. 22. 135-144 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report III)" Transactions of JWRI. 22. 157-168 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report IV)" Transactions of JWRI. 22. 169-176 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "Experimental Verification for Predicting Method of Welding Residual Stresses in T-joints Using Inherent Strain --A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report IV)--" Q.J.JWS. Vol.11. 327-333 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "TL_yL_z Method and T Method for Measurement of 3-Dimensional Residual Stresses in Bead-on-plate Welds --Estimating and Measuring Methods of Residual Stresses Using Inherent Strain Distribution Described as Functions (Report 2)--" Q.J.JWS. Vol.11. 555-562 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "Three dimensional Numerical Simulation of Various thermo-Mechanical Processes by FEM (Report III) --Deformation Analysis of Compressors under Assembly by Plug Welding--" Trans.JWRI. Vol.22. 127-134 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "Simulation of Welding Deformation for Accurate Ship Assembling (Report II) --Influence of Initial Geometrical Imperfection on Butt Welded Plate--" Trans.JWRI. Vol.22. 135-144 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report III) --Prediction of Residual Stresses in T- and I-Joints Using Inherent Strains--" Trans.JWRI. Vol.22. 157-168 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yukio Ueda et al.: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report IV) --Experimental Verification for Predicting Method of Welding Residual Stresses in T-Joints Using Inherent" Trans.JWRI. Vol.22. 169-176 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 上田 幸雄: "T型継手の固有ひずみによる溶接残留応力推定法の実験的検証-溶接残留応力の生成源を用いた残留応力推定法(第4報)-" 溶接学会論文集. 11. 327-333 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 上田 幸雄: "ビードオンプレート溶接における3次元残留応力のTL_y L_z法およびT法による測定" 溶接学会論文集. 11. 555-562 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yukio Ueda: "Three dimensional Numerical Simulation of Various thermo-Mechanical Processes by FEM(Report III)" Transactions of JWRI. 22. 127-134 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yukio Ueda: "Simulation of Welding Deformation for Accurate Ship Assembling(Report II)" Transactions of JWRI. 22. 135-144 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yukio Ueda: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress(Report III)" Transactions of JWRI. 22. 157-168 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yukio Ueda: "A Predicting Method of Welding Residual Stress Using Source of Residual Stress(Report IV)" Transactions of JWRI. 22. 169-176 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 上田 幸雄: "高精度組立のための溶接変形シミュレーション(第1報)板継溶接時の面内変形" 日本造船学会論文集. 171. 335-344 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 上田 幸雄: "高精度組立のための溶接変形シミュレーション(第2報)板継溶接時の面内変形に及ぼす初期不整の影響" 日本造船学会論文集. 172. 559-566 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 上田 幸雄: "固有ひずみの関数表示法および推定法ー固有ひずみ分布の関数表示による残留応力の推定法と測定法(第1報)ー" 溶接学会論文集. 11. 189-195 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 上田,村川 他: "高精度組立のための溶接変形シミュレ-ション(第一報)板継溶接時の面内変形" 日本造船学会論文集. 第171号. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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