Numerical analysis model for fluid flow in laser+GMAW hybrid welding

Based on FLUENT software, an adaptive and computationally efficient numerical analysis model for fluid flow in laser+GMAW hybrid welding was developed. Arc heat input and laser energy were described using double-ellipsoid heat source model and cone model based keyhole size, respectively. Metal filling in hybrid welding was treated as the process of liquid metal flowing into weld pool from the boundary above the weld pool at a certain velocity, and the droplet transfer frequency was considered through applying the time pulse function to flow velocity of liquid metal. For this model, the calculation of keyhole was simplified and the influence of bent keyhole on fluid flow pattern in hybrid weld pool was mainly taken into account. HJ1.5mmThe fluid flow and keyhole behavior in laser+GMAW hybrid welding were simulated and analyzed by FLUENT. The results show that the established model can reflect the main features of keyhole and fluid flow in laser+GMAW hybrid welding and improve the calculation efficiency.