Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur

Abstract : Hybrid arc / laser welding represents the solution for high thickness steel sheets assembly. The laser heat source added to the MIG torch improves the process productivity while respecting quality standards. Nevertheless, the phenomenology of the process remains complex and not totally understood. This is the thrust for the development of numerical simulation. The present study has been carried out as part of the "SISHYFE" Material and Process ANR project.For that purpose, a new non stationary 3D finite element model has been developed. Based on the level set approach, it allows to simulate a multipass hybrid arc/ laser welding process. The work focused on four research axes. (1) A more representative model of the plasma heat source has been defined, based on thermal radiation. (2) The coupling of a material and a heat source term integrated in the conservation equations and the update of the level set gas / metal interface is able to correctly model the formation of the weld bead. (3) The integration of a fluid flow model within the level set approach has been evaluated and its impact on thermal distribution analyzed. (4) The stress formation during and after the process has been modeled through the adaptation of a thermo-mechanical solver to the previous modeling in a level set framework.In the end, the developed model has shown to be able to simulate an industrial multi-pass hybrid arc / laser welding process. Experimental measurements provided by the project partners have been used to evaluate the model and to assess its abilities to reproduce experimental features.
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Olivier Desmaison. Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0079⟩. ⟨pastel-00982377⟩

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