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http://dx.doi.org/10.3795/KSME-B.2004.28.10.1202

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

Ha Eung-Ji (한양대학교 대학원 기계공학과)
Kim Woo-Seung (한양대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.10, 2004 , pp. 1202-1209 More about this Journal
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
Laser Welding; free Surface; Marangoni Convection; Continuum Surface force;
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1 Swaminathan, C. R. and Voller, V. R., 1993, 'On the Enthalpy Method,' Int. J. Num. Meth. Heat Fluid Flow, Vol. 3, pp. 233-244   DOI
2 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   DOI   ScienceOn
3 Brackbill, J. U. and Kothe, D. B., 1996, 'Dynamicmodeling of Surface Tension,' LA-UR-96-1706
4 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
5 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
6 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   DOI   ScienceOn
7 Duley, W. W., 1999, 'Laser Welding,' John Wiley & Sons, Inc.
8 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
9 Basu, S. and Debroy, T., 1992, 'Liquid Metal Expulsion During Laser Irradiation,' J. Appl. Phys., Vol. 72, pp. 3317-3322   DOI
10 Robert, A. and Debroy, T., 2001, 'Geometry of Laser Spot Welds form Dimensionless Numbers,' Metall. Trans. B, Vol. 32B, pp. 941-947   DOI   ScienceOn
11 Rider, W. J. and Kothe, D. B., 1998, 'Reconstructing Volume Tracking,' J. Comput. Phys., Vol. 141, pp. 112-152   DOI   ScienceOn
12 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   DOI   ScienceOn
13 Kothe, D. B. and Mjolsness, R. C., 1991, 'RIPPLE: A New Model for Incompressible Flows with Free Surfaces,' AIAA 91-3548
14 Bauerle, D., 1996, 'Laser Processing and Chemistry,' Springer