Modeling of transport phenomena in hybrid laser-MIG keyhole welding |
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| Authors: | J. Zhou H.L. Tsai |
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| Affiliation: | 1. Department of Mechanical Engineering, Pennsylvania State University Erie, Erie, PA 16563, USA;2. Department of Mechanical and Aerospace Engineering, University of Missouri-Rolla, 1870 Miner Circle, Rolla, MO 65409-1350, USA;1. School of Material Science and Engineering, Dalian University of Technology, Key Laboratory of Liaoning Advanced Welding and Joining Technology, Dalian 116024, China;2. Shanghai Institute of Special Equipment Inspection and Technical Research,Shanghai 200062, China;1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, PR China;1. School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining, Shandong University, Jinan 250061, China;2. Technische Hochschule Brandenburg, Brandenburg an der Havel, D-14770, Germany;3. BIAS- Bremer Institut fuer Angewandte Strahltechnik, Bremen, D-28359, Germany |
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| Abstract: | 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. |
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