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Numerical simulation of welding positions in Gas Tungsten Arc Welding

Abstract : The fluid flow in weld pool can play a prominent role in the weld quality as well as in the shape of the weld bead seam. It is influenced by several process parameters and operating conditions such as current intensity, welding speed, chemical composition of the material and welding positions. A coupled model that accounts for electromagnetism, heat transfer and fluid flow with moving free surface has been developed. It aims at predicting temperature field, fluid flow velocity in the melting pool and shape of weld joints for various operating parameters. Numerical simulations are carried out with our in-house finite element code Cast3M to study the influence of welding positions flat, horizontal, vertical up, vertical down and overhead. It turns out that there exists a strong sensitivity of the molten pool shape to welding positions due to different gravity direction. The present work enables us to undertake the development of a more advanced numerical model that will include metal filling.
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M. Nguyen, O. Asserin, S. Gounand, P. Gilles, M. Médale. Numerical simulation of welding positions in Gas Tungsten Arc Welding. 11th International Seminar Numerical Analysis of Weldability, Sep 2015, Graz, Austria. ⟨hal-02445729⟩

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