Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Improvement of Numerical Thermal Analysis for Steel Welds

철강 용접부 열해석 정도 향상에 관한 연구

  • 강윤희 (POSCO 기술연구소 접합연구그룹) ;
  • 김충명 (POSCO 기술연구소 접합연구그룹) ;
  • 홍현욱 (POSCO 기술연구소 접합연구그룹) ;
  • 이종봉 (POSCO 기술연구소 접합연구그룹)
  • Published : 2007.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

This paper is the first part of the study on the accuracy improvement of numerical analysis of steel welds. The aim of this paper is to raise the accuracy of thermal analysis results, such as the shape and size of the weld cross section and the hardness distribution in HAZ(Heat-Affected Zone). It is known that the factors affecting on the accuracy are thermal properties, metallurgical properties and welding heat source model. It was found that the arbitrary distributed heat source model should be used to predict practical weld cross section shape and size. Also, in order to improve the prediction accuracy of HAZ hardness distribution, it was essential to consider 2 CCT(Continuous Cooling Transformation) diagrams in calculating volume fraction of transformed phases. One is the peak temperature being around melting temperature. The other is the peak temperature being around metallurgical transformation temperature.

Keywords

References

  1. Lars-Erik Lindgren: Finite element modeling and simulation of welding. Part 1: Increased complexity, Journal of Thermal Stresses, Vol.24 (2001), 141- 192 https://doi.org/10.1080/01495730150500442
  2. Lars-Erik Lindgren: Finite element modeling and simulation of welding. Part 2: Improved material modeling, Journal of Thermal Stresses, Vol.24 (2001), 195-231 https://doi.org/10.1080/014957301300006380
  3. J. Goldak, A. Chakravarti and M. Bibby: A new finite element model for welding heat sources, Metallurgical Trans. B, Vol.15B (1984), 299-305
  4. J. Goldak, M. Bibby, J. Moore, R. House and B. Patel: Computer modeling of heat flow in welds, Metallurgical Trans. B. Vol.17B (1986), 587-600
  5. C.K. Leung and R.J. Pick: The use of generalized plane strain elements in the prediction of residual stresses in welded flat plates, Proc. of the Symposium on the Computer Modelling of Fabrication Processes and Constitutive Behavior of Metals, (1986), 563
  6. S. Das, U. Upadhya, U. Chandra, M.J. Kleinosky and M.L. Tims: Finite element modeling of a single- pass GMA weldment, Proc. of the 6th Int. Conf. Modeling of Casting, Welding and Advanced Solidification Processes, (1993), 593
  7. P. Michaleris and A. DeBiccari: Prediction of welding distortion, Welding Journal, Vol.76, No.4 (1997), 172-181
  8. J. Zhang, Y.Dong and A. Nanjundan: An enhanced heat source model for gas metal arc welding, Mathematical Modelling of Weld Phenomena 5, (2001)