Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Numerical Analysis of Welding Residual Stresses for Ultra-Thick Plate of EH40 Steel Joined by Tandem EGW

극후판 EH40 TMCP강재 Tandem EGW 용접부의 잔류응력 해석

  • Hwang, Se-Yun (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Jang-Hyun (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Byung-Jong (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Yang, Yong-Sik (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 황세윤 (인하대학교 조선해양공학과) ;
  • 이장현 (인하대학교 조선해양공학과) ;
  • 김병종 (인하대학교 조선해양공학과) ;
  • 양용식 (인하대학교 조선해양공학과)
  • Received : 2010.04.18
  • Accepted : 2010.10.18
  • Published : 2010.12.20
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Abstract

Deck plates and hatch coming of large container carrier and offshore structures are joined by ultra-thick plates whose thickness is more than 60mm. Traditionally FCAW has been used to join the thick plates in butt joint. However, FCAW has been replaced with EGW since the welding efficiency of EGW is higher than that of FCAW. Tandem EGW using two electrodes has been applied to vertical position welding by several shipyards. EGW requires one or two layers of bead whereas FCAW requires more than 20 layers of weld bead in thick welding. However, high welding residual stresses are generated by EGW since it uses higher heat input than FCAW. In the present study, a finite element model is suggested to predict the residual stresses induced by the tandem EGW. Butt specimen of EH40 TMCP shipbuilding steel plates vertical welding was modeled by a three-dimensional model. Residual stresses were measured by X-ray diffraction method and to verify the numerical result. The results show a good agreement with experimental result.

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References

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