T型すみ肉溶接継手の角変形挙動の計測実験と数値解析 : 溶接金属の変態膨張による溶接角変形低減手法に関する研究(第1報)  [in Japanese] Measurement and Numerical Simulation of Angular Distortion of Fillet Welded T-joints : Welding Angular Distortion Control by Transformation Expansion of Weld Metals (Report 1)  [in Japanese]

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Author(s)

    • 三上 欣希 MIKAMI Yoshiki
    • 大阪大学 大学院工学研究科 マテリアル生産科学専攻 Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
    • 望月 正人 [他] MOCHIZUKI Masahito
    • 大阪大学 大学院工学研究科 マテリアル生産科学専攻 Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
    • 豊田 政男 TOYODA Masao
    • 大阪大学 大学院工学研究科 マテリアル生産科学専攻 Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

Abstract

A newly developed low-transformation-temperature welding wire, of which transformation start temperature is lower than that of conventional welding wires for 490-MPa class structural steels, was applied to fabrication of fillet welded T-joints. The welding angular distortion and the temperature profile of the weld metal were continuously measured during the welding process. The angular distortion of the fabricated T-joint was reduced when the weld metal reached the martensitic transformation start temperature. The residual angular distortion was less with the low-transformation-temperature welding wire than that with the conventional wire. It was also determined that the transformation start temperature of the weld metal rose from 205℃ to 380℃ resulting from dilution of chemical composition from the base metal. The welding distortion of T-joints was calculated by a numerical simulation with consideration of the effect of phase transformation under weld thermal cycles. Material properties used in the numerical simulation such as continuous cooling transformation diagrams and dilatometric curves were determined by actual measurement with specimens extracted from the weld metals of the fabricated joints. The welding distortion was reproduced with high accuracy in the numerical simulation. Results of numerical simulation also determined that there was a direct correspondence between the transformation expansion of the weld metal and the angular distortion.

Journal

  • Quarterly journal of the Japan Welding Society.

    Quarterly journal of the Japan Welding Society. 24(4), 312-323, 2006-11-05

    Japan Welding Society

References:  25

Cited by:  4

Codes

  • NII Article ID (NAID)
    110004851658
  • NII NACSIS-CAT ID (NCID)
    AN1005067X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02884771
  • NDL Article ID
    8575731
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-939
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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