Multiphysical modelling of keyhole formation during dissimilar laser welding
Résumé
In the present study, time-dependent multiphysical simulation of pulsed and continuous laser welding of dissimilar metals, based on Moving Mesh approach, is proposed. Strong coupling between heat transfer, laminar compressible flow and ALE is used. The model allows following the thermal field, free surface deformation and convection phenomena during the development of melted zone. In the first place, the model was applied to a case of single material (Ti6Al4V alloy) and successfully validated by comparison with experimental weld dimensions. Next, the model was applied for studying of keyhole dynamics and melted zone development in a case of dissimilar materials, in pulsed and continuous laser mode. The effect of discontinuity of physical properties across the joint line on keyhole behavior was studied for dissimilar couple Ti6Al4V/stainless steel.
Domaines
Physique [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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