Heat transfer and fluid flow and their effects on the solidification microstructure in full-penetration laser welding of aluminum sheet

Shaoning Geng^a, Ping Jiang^a^,^*(

), Xinyu Shao^a, Lingyu Guo^b, Xuesong Gao^b

Fig. 13.. The dendritic structures and their microstructure scale under various cooling rate in three welding cases: (a) (c) Case I - P_L = 2500 W, V = 80 mm/s; (b) (e) Case II - P_L = 3000 W, V = 120 mm/s; (c) (f) Case III - P_L = 3500 W, V = 180 mm/s. (a), (b) and (c) are experimental results tested by SEM; (d) (e) and (f) are phase-field simulated results colored by the Mg content.