8.5 Dynamic Dilution Behavior of Moving Weld Pools …
241
(a) Point X closer to the keyhole
Time ms
"Wire" element
Al element
Concentration/(x 100%)
Time ms
"Wire" element
Al element
Concentration/(x 100%)
(b) Point Y further from the keyhole
Fig. 8.34 Variations in the intensity of dilution of Al composition at different positions in the upper
part of the moving weld pool
8.5.3 Dynamic Dilution Behavior in Transient Weld Pools
Both the process of single-beam laser welding and the process of laser welding
with filler wires can reach a relatively steady state. But, according to the simulation
results in Chap. 4 and this chapter, the keyhole in the two welding processes is in
the course of periodic oscillation under most technical conditions. The moving weld
pool is always in a high-speed transient change in both laser welding processes,
thanks to the close relationship and coupling of the keyhole and moving weld pool
behaviors. The dynamic dilution behavior in the quasi-steady moving weld pool
is studied systematically in the previous section. This section studies the dynamic
dilution behavior in the transient moving weld pool in the course of laser welding.