TED-AJ03-141 MODELING THE TRANSPORT PHENOMENA DURING GAS METAL ARC WELDING PROCESS
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概要
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A comprehensive mathematical model and the associated numerical technique have been developed to simulate the coupled, interactive transport phenomena between the electrode (droplets), the arc plasma, and the workpiece (weld pool) during a gas metal arc welding process. The simulation involves arc plasma generation, electrode melting, droplet formation, detachment, transfer, and impingement onto the workpiece, and weld pool dynamics. During transfer from the tip of the electrode to the workpiece, the droplet subjects to gravity, electromagnetic force, surface tension, and arc plasma drag force. Transient temperature and velocity distributions of the arc plasma, shapes of the electrode, droplet, and weld pool, and heat transfer and fluid flow in the weld pool are all calculated in a single, unified model. [figure] Fig. A-1 shows temperature and velocity distributions during the growth of the weld puddle. As shown in Fig. A-2,the predicted solidified weld bead shape compares favorably with the experimental result. In the process of droplet formation, the balance among gravity, surface tension, electromagnetic force, and arc drag force determines the formation, the size, and the transfer frequency of droplets. Electromagnetic force is a key factor for neck formation and droplet detachment. It was found a minimum shielding gas flow rate is required to protect the weld pool from exposing to ambient leading to oxidation. However, the shielding gas flow rate doesn't have significant effects on droplet formation, detachment and weld pool dynamics. [figure]
- 一般社団法人日本機械学会の論文
著者
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Marin S.
Research And Development Center General Motors Corporation
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Wang P.
Research And Development Center General Motors Corporation
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ZHU F.
Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri
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TSAI H.
Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri
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Tsai H.
Department Of Mechanical And Aerospace Engineering And Engineering Mechanics University Of Missouri
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