Modeling of Transport Phenomena in Hybrid Laser-MIG Keyhole Welding
Mathematical models and associated numerical techniques have been developed to investigate the complicated transport phenomena in spot hybrid laser-MIG keyhole welding. A continuum formulation is used to handle solid phase, liquid phase, and the mushy zone during the melting and solidification processes. The volume of fluid (VOF) method is employed to handle free surfaces, and the enthalpy method is used for latent heat. Dynamics of weld pool fluid flow, energy transfer in keyhole plasma and weld pool, and interactions between droplets and weld pool are calculated as a function of time. The effect of droplet size on mixing and solidification is investigated. It is found that weld pool dynamics, cooling rate, and final weld bead geometry are strongly affected by the impingement process of the droplets in hybrid laser-MIG welding. Also, compositional homogeneity of the weld pool is determined by the competition between the rate of mixing and the rate of solidification.
J. Zhou and H. Tsai, "Modeling of Transport Phenomena in Hybrid Laser-MIG Keyhole Welding," International Journal of Heat and Mass Transfer, Elsevier, Aug 2008.
The definitive version is available at http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.02.011
Mechanical and Aerospace Engineering
General Motors Corporation
Keywords and Phrases
Hybrid Laser-MIG Welding; Keyhole; Mathematical Model; Diffusion; Mixing
Article - Journal
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