Techniques de Mesures Multiphysiques en Soudage à l'arc – TEMMSA

The project wants to investigate physical interactions inherent to welding arc. The analysis of the interaction is based on fine multiphysical instrumentation during the process. Coupling information will enable us to understand and model some unexplained phenomenas. From the thermal point of view, acquisition will be done by thermocouples placed on the workpiece but also on the clamping device. From the mechanical point of view, forces induced by welding will be measured and some displacements (point wise and full field) will be measured in the vicinity of the melt pool. These measurements will be coupled with a fast camera that will enables us to study the shape and the size of the weld pool and modifications in relation with process parameters. The originality of the project comes from the dialog between local measurements around the weld pool and global measurements. From the point of view of applications, we will focus interested on the reduction of the distortions induced by welding and in the mass transfer in the MIG or MAG. A particular effort will be also made on the level of the observations and modeling of hot cracking during solidification.