Combination of Eulerian and ray-tracing approaches for copper laser welding simulation

Laser welding of pure copper and its alloys is a challenging process with growing industrial interest due to the latest development in field electric mobility. The difficulties are mainly related material's high thermal conductivity poor absorptivity few percent at classical IR laser (YAG). It also well known that such configuration can lead formation undesirable defects, as pores or spatters consequence melt pool instabilities. has been observed experimentally usage both speed power tends limit those Although this positive influence already for equivalent materials, physical explanation not yet available. In perspective, multiphysical simulation scale currently being developed by using comsol Multiphysics® software. latter includes an Eulerian interface tracking method liquid-gas (phase field) ray-tracing description beam take into account well-known trapping effect under keyhole regime. For sake time computation, numerical model first axisymmetric coordinate system (r,z) be representative spot validate coupling methodology. will then extended 3D case used predictive tool make appropriate choices on parameters obtain good quality welds (stable pool, low porosity rate, etc.).