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Prediction of Weld Residual Stress of Narrow Gap Welds

협개선 용접부에 대한 용접잔류응력 예측

  • Yang, Jun-Seog (Nuclear Power Laboratory, Korea Electric Power Research Institute) ;
  • Heo, Nam-Su (School of Mechanical Design and Automation Engineering, Seoul National University of Technology)
  • 양준석 (한전 전력연구원 원자력발전연구소) ;
  • 허남수 (서울산업대학교 기계설계자동화공학부)
  • Published : 2010.01.01

Abstract

The conventional welding technique such as shield metal arc welding has been mostly applied to the piping system of the nuclear power plants. It is well known that this welding technique causes the overheating and welding defects due to the large groove angle of weld. On the other hand, the narrow gap welding(NGW) technique has many merits, for instance, the reduction of welding time, the shrinkage of weld and the small deformation of the weld due to the small groove angle and welding bead width comparing with the conventional welds. These characteristics of NGW affect the deformation behavior and the distribution of welding residual stress of NGW, thus it is believed that the residual stress results obtained from conventional welding procedure may not be applied to structural integrity evaluation of NGW. In this paper, the welding residual stress of NGW was predicted using the nonlinear finite element analysis to simulate the thermal and mechanical effects of the NGW. The present results can be used as the important information to perform the flaw evaluation and to improve the weld procedure of NGW.

Keywords

Weld Residual Stress;Narrow Gap Weld;Finite Element Analysis

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