Modélisation du procédé de soudage hybride Arc / Laser par une approche level set application aux toles d'aciers de fortes épaisseurs

Abstract

Abstract. The hybrid arc/laser welding process has been developed in order to overcome the difficulties encountered for joining high thickness steel sheets. This innovative process gathers two heat sources: an arc source developed by a MIG torch and a prelocated laser source. This coupling improves the efficiency of the process, the weld bead quality and the final deformations. The Level-Set approach for the modelling of this process enables the prediction of the weld bead development and the temperature field evolution. The simulation of the multi-passes welding of a 18MnNiMo5 steel grade is detailed and the results are compared to the experimental observations. Résumé. Le procédé de soudage hybride Arc/Laser est une solution aux assemblages difficiles de tôles de fortesépaisseurs. Ce procédé innovant associe deux sources de chaleur : un arcélectrique produit par une torche MIG et une source laser placée en amont. Ce couplage améliore le rendement du procédé, la qualité du cordon et les déformations finales. La modélisation de ce procédé par une approche Level Set permet une prédiction du développement du cordon et du champ de température associé. La simulation du soudage multi-passes d'une nuance d'acier 18MnNiMo5 est présentée ici et les résultats sont comparés aux observations expérimentales.

Three-dimensional cellular automaton-finite element modeling of solidification grain structures for arc-welding processes

“…The first parameter is determined by an energy balance involving the kinetic energy of the droplets, the hydrostatic pressure and the liquid-gas surface tension. This balance was originally suggested by Kumar and Bhaduri [26] and corrected by Desmaison et al [18,24]. The second parameter is simply equal to twice the value of the droplet radius, as proposed by Bellet [25].…”

A level set approach for the simulation of the multipass hybrid laser/GMA welding process

“…This second source will be defined in §2.3. The surface heat flux due to plasma transfer, q p , is defined as an angular Gaussian condition [31] (see Figure 4):…”

“…More details about the resolution of this equation are available in [3]. Volume and energy balances from a 2D material supply model have been carried out in [31] to validate the heat and material supplies models presented up to this point.…”

“…Implementation details about the numerical resolution can be found in ref. [31]  The first step is the heat transfer resolution through Eq. (3), in which the velocity field taken into account in the advection term is v  issued from the resolution of Eq.…”

“…The solvers presented here have been validated, especially in terms of energy and mass conservation. The interested reader can refer to [31] …”