A thermo-hydraulic numerical model to study spot laser welding

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HAL Id: hal-01507584

https://hal.archives-ouvertes.fr/hal-01507584 Submitted on 13 Apr 2017

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Public Domain

A thermo-hydraulic numerical model to study spot laser

welding

Marc Medale, Charline Xhaard, Rémy Fabbro

To cite this version:

Marc Medale, Charline Xhaard, Rémy Fabbro. A thermo-hydraulic numerical model to study spot laser welding. 8e Colloque national en calcul des structures, CSMA, May 2007, Giens, France. �hal-01507584�

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* Polytech' Marseille, Lab. IUSTI, UMR 6595 CNRS - Université de Provence Technopole de Château-Gombert, 5 rue Enrico Fermi

13453 Marseille Cedex 13

** CEA, Centre de Valduc, DAM/DFTN 21120 IS sur TILLE

*** CLFA/LALP, UPR CNRS 1578, 16 bis avenue Prieur de la Côte d'Or 94114 Arcueil Cedex

Marc.Medale@polytech.univ-mrs.fr

RÉSUMÉ. Un modèle numérique thermo-hydraulique pour l'étude du soudage laser

impulsionnel. L'objectif de cette étude vise à mieux comprendre les mécanismes de base à l'origine de défauts en cours de soudage par laser impulsionnel. Dans ce but, nous avons développé un modèle numérique qui tient compte de la dynamique de creusement en mode key-hole, ainsi qu'un modèle de dépôt d'énergie incluant les effets de réflexions multiples. Plusieurs expériences ont permis de mettre en évidence divers types de défauts. Les simulations numériques de certains de ces scénarios ont été effectuées et comparées aux résultats éxpérimentaux.

ABSTRACT. The aim of this study is to better understand the basic mechanisms leading to defect occurrence in spot laser welding. For that purpose we have developed a numerical model, which takes into account the key-hole dynamics together with a dedicated energy deposition model featuring the multiple reflection effects. Many experiments have also been achieved enabling us to report several defect classes. The analysis of some of these scenarios have been performed and favourably compared to experiments.

MOTS-CLÉS: Mécanique des Fluides Numérique ; Soudage laser impulsionnel ; Surface libre

et mobile.

KEYWORDS: Computational Fluid Mechanics; Spot laser welding; Free and moving interface.

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