Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Study of tow-Power Density Laser Welding Process with Evolution of me Surface

자유표면변형을 고려한 저에너지밀도 레이저 용접공정 해석

  • 하응지 (한양대학교 대학원 기계공학과) ;
  • 김우승 (한양대학교 기계공학과)
  • Published : 2004.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, numerical investigation has been performed on the evolution of weld pool geometry with moving free surface during low-energy density laser welding process. The free surface elevates near the weld pool edge and descends at the center of the weld pool if d$\sigma$/dT is dominantly negative. It is shown that the predicted weld pool width and depth with moving free surface are a little greater than those with flat weld pool surface. It is also believed that the weld pool surface oscillation during the melting process augments convective heat transfer rate in the weld pool. The present analysis with moving free surface should be considered when We number is very small compared to 1.0 since the deformation of the weld pool surface is noticeable as We number decreases.

Keywords

References

  1. Bauerle, D., 1996, 'Laser Processing and Chemistry,' Springer
  2. Duley, W. W., 1999, 'Laser Welding,' John Wiley & Sons, Inc.
  3. Chan, C., Mazumder, J. and Chen, M. M., 1984, 'Two-Dimensional Transient Model for Convection in Laser Melted Pool.' Metall. Trans. A, Vol. 15A, pp. 2175-2184
  4. Basu, S. and Debroy, T., 1992, 'Liquid Metal Expulsion During Laser Irradiation,' J. Appl. Phys., Vol. 72, pp. 3317-3322 https://doi.org/10.1063/1.351452
  5. Robert, A. and Debroy, T., 2001, 'Geometry of Laser Spot Welds form Dimensionless Numbers,' Metall. Trans. B, Vol. 32B, pp. 941-947 https://doi.org/10.1007/s11663-001-0080-0
  6. Rider, W. J. and Kothe, D. B., 1998, 'Reconstructing Volume Tracking,' J. Comput. Phys., Vol. 141, pp. 112-152 https://doi.org/10.1006/jcph.1998.5906
  7. Brackbill, J. U., Kothe, D. B. and Zemach, C. A., 1992, 'Continuum Method for Modeling Surface Tension,' J. Comput. Phys., Vol. 100, pp. 335-354 https://doi.org/10.1016/0021-9991(92)90240-Y
  8. Kothe, D. B. and Mjolsness, R. C., 1991, 'RIPPLE: A New Model for Incompressible Flows with Free Surfaces,' AIAA 91-3548
  9. Swaminathan, C. R. and Voller, V. R., 1993, 'On the Enthalpy Method,' Int. J. Num. Meth. Heat Fluid Flow, Vol. 3, pp. 233-244 https://doi.org/10.1108/eb017528
  10. Sasmal, G. P. and Hochstein, J. I., 1994, 'Marangoni Convection with a Curved and Deforming Free Surface in a Cavity,' J. Fluid Eng., Vol. 116, pp. 577-582 https://doi.org/10.1115/1.2910316
  11. Brackbill, J. U. and Kothe, D. B., 1996, 'Dynamicmodeling of Surface Tension,' LA-UR-96-1706
  12. Sahoo, P., Debroy, T. and McNallan, M. J., 1988, 'Surface Tension of Binary Metal - Surface Active Solute Systems Under Conditions Relevant to Welding Metallurgy,' Metall. Trans. B, Vol. 19B, pp. 483-491
  13. Pitscheneder, W., Debroy, T., Mundra, K. and Ebner, R., 1996, 'Role of Sulfur and Processing Variables on the Temporal Evolution of Weld Pool Geometry During Multikilowatt Laser Beam Welding of Steels,' Weld. J., Vol. 75, pp. 71s-80s
  14. Hirsch, J. W., Olson, L. G., Nazir, Z. and Alexander, D. R., 1998, 'Axisymmetric Laser Welding of Ceramics: Comparison of Experimental and Finite Element Results,' Opt. Lasers Eng., Vol. 29, pp. 465-484 https://doi.org/10.1016/S0143-8166(97)00053-5