Dynamical Behaviors of Keyhole and Weld Pool in Vacuum Laser Welding

This chapter introduces the dynamics behaviors of keyhole and weld pool in vacuum laser welding. Mathematical model for simulating time dependent keyhole and weld pool dynamics in vacuum laser welding is given. The physical behaviors of keyhole dynamics and flow pattern of weld pool under vacuum welding are discussed. The mechanisms of penetration increase under vacuum conditions are explained using numerical simulations.