8.3 Keyhole and Weld Pool Dynamics in Welding with Filler Wires
217
Fig. 8.13 Transient formation process of the moving weld pool in contact transition
part (except the molten droplet part) represents the keyhole, and the red part between
the blue part and the keyhole represents the weld pool. Figure 8.12a through Fig. 8.12f
show the cross-section views of the weld pool in contact transition after 0 ms, 1.78 ms,
4.63 ms, 7.51 ms, 11.44 ms and 15.15 ms respectively. It can be seen from the figures
that with the advancing of the welding process, the liquid in the weld pool gradually
increases along the keyhole back edge and the weld pool volume also increases;
the molten droplets not only accumulate in the weld pool front edge but also melt
partial parent metal. As the molten droplets continuously enter the weld pool, a large
protrusion emerges on the front wall of the keyhole, which is very evident at the
moment of 15.15 ms.
Figure 8.14 shows the three-dimensional free interface morphology in contact
transition, where color represents temperature and blue plane represents the parent
metal surface. Figure 8.14a through Fig. 8.14f show three-dimensional free interface
morphology at 0 ms, 1.78 ms, 4.63 ms, 7.51 ms, 11.44 ms and 15.15 ms, respectively.
The temperature field indicates that the temperature at the corresponding position
of the parent metal starts to rise when the high-temperature liquid at the end of the
Fig. 8.14 Evolution process of three-dimensional free interface morphology in contact transition
217
Fig. 8.13 Transient formation process of the moving weld pool in contact transition
part (except the molten droplet part) represents the keyhole, and the red part between
the blue part and the keyhole represents the weld pool. Figure 8.12a through Fig. 8.12f
show the cross-section views of the weld pool in contact transition after 0 ms, 1.78 ms,
4.63 ms, 7.51 ms, 11.44 ms and 15.15 ms respectively. It can be seen from the figures
that with the advancing of the welding process, the liquid in the weld pool gradually
increases along the keyhole back edge and the weld pool volume also increases;
the molten droplets not only accumulate in the weld pool front edge but also melt
partial parent metal. As the molten droplets continuously enter the weld pool, a large
protrusion emerges on the front wall of the keyhole, which is very evident at the
moment of 15.15 ms.
Figure 8.14 shows the three-dimensional free interface morphology in contact
transition, where color represents temperature and blue plane represents the parent
metal surface. Figure 8.14a through Fig. 8.14f show three-dimensional free interface
morphology at 0 ms, 1.78 ms, 4.63 ms, 7.51 ms, 11.44 ms and 15.15 ms, respectively.
The temperature field indicates that the temperature at the corresponding position
of the parent metal starts to rise when the high-temperature liquid at the end of the
Fig. 8.14 Evolution process of three-dimensional free interface morphology in contact transition