116
4 Simulation of Transient Keyhole and Weld Pool
Fig. 4.8 A top view of velocity fields of weld pool surface at 35.72 ms in laser welding
Fig. 4.9 A longitudinal section view of velocity fields at 35.72 ms in laser welding
keyhole is always in the continuous oscillatory closure, the interaction between the
recoil pressure and the periodic convex platform on the walls of the keyhole will
produce a special periodic, characteristic flow moving upward along the back wall
of the keyhole. This characteristic motion will result in a wave-like flow state on the
4 Simulation of Transient Keyhole and Weld Pool
Fig. 4.8 A top view of velocity fields of weld pool surface at 35.72 ms in laser welding
Fig. 4.9 A longitudinal section view of velocity fields at 35.72 ms in laser welding
keyhole is always in the continuous oscillatory closure, the interaction between the
recoil pressure and the periodic convex platform on the walls of the keyhole will
produce a special periodic, characteristic flow moving upward along the back wall
of the keyhole. This characteristic motion will result in a wave-like flow state on the