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Article Dans Une Revue Journal of Laser Applications Année : 2022

Combination of Eulerian and ray-tracing approaches for copper laser welding simulation

Résumé

Laser welding of pure copper and its alloys is a challenging process with a growing industrial interest due to the latest development in the field of electric mobility. The difficulties are mainly related to the material's high thermal conductivity and a poor absorptivity of few percent at the classical IR laser (YAG). It is also well known that such a configuration can lead to the formation of undesirable defects, such as pores or spatters as a consequence of melt pool instabilities. It has been observed experimentally that the usage of a laser at both high speed and high power tends to limit those instabilities. Although this positive influence has already been observed for equivalent materials, a physical explanation is not yet available. In this perspective, a multiphysical simulation of the process at the melt pool scale is currently being developed by using comsol Multiphysics® software. The latter includes an Eulerian interface tracking method for the liquid-gas interface (phase field) and a ray-tracing description of the laser beam to take into account the well-known beam trapping effect under a keyhole regime. For the sake of time computation, the numerical model is first developed in an axisymmetric coordinate system (r,z) to be representative of a laser spot welding process and to validate the numerical coupling methodology. The model will then be extended to a 3D welding case and used as a predictive tool to make appropriate choices on welding parameters to obtain good quality welds (stable melt pool, low porosity rate, etc.).
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Dates et versions

hal-04072617 , version 1 (18-04-2023)

Identifiants

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Julien Daligault, Morgan Dal, Cyril Gorny, Frédéric Coste, Rémy Fabbro. Combination of Eulerian and ray-tracing approaches for copper laser welding simulation. Journal of Laser Applications, 2022, 34 (4), pp.042042. ⟨10.2351/7.0000786⟩. ⟨hal-04072617⟩
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