Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Analysis of Welding Residual Stress Using Heat Source Models for the Multi-Pass Weldment

  • Bae, Dong-Ho (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Chul-Han (Mechanical Engineering Department, Sungkyunkwan University) ;
  • Cho, Seon-Young (Mechanical Engineering Department, Sungkyunkwan University) ;
  • Hong, Jung-Kyun (Research Scientist, Battelle Memorial Institute) ;
  • Tsai, Chon-Liang (Department of Industrial, Welding and Systems Engineering, The Ohio state University)
  • Published : 2002.09.01
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Abstract

Numerical prediction of welding-induced residual stresses using the finite element method has been a common practice in the development or refinement of welded product designs. Various researchers have studied several thermal models associated with the welding process. Among these thermal models, ramp heat input and double-ellipsoid moving source have been investigated. These heat-source models predict the temperature fields and history with or without accuracy. However, these models can predict the thermal characteristics of the welding process that influence the formation of the inherent plastic strains, which ultimately determines the final state of residual stresses in the weldment. The magnitude and distribution of residual stresses are compared. Although the two models predict similar magnitude of the longitudinal stress, the double-ellipsoid moving source model predicts wider tensile stress zones than the other one. And, both the ramp heating and moving source models predict the stress results in reasonable agreement with the experimental data.

Keywords

References

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