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

Shaoning Geng, Ping Jiang, Xinyu Shao, Lingyu Guo, Xuesong Gao

Table 1 Thermo-physical properties of 5083 aluminum alloy used in this work [36,37].

Physical properties Value Density of liquid (Dl) 2380 kg/m3 Density of solid (Ds) 2660 kg/m3 Viscosity (μ) 1.2 × 10-3 kg/m s Specific heat of liquid (Cp,l) 1198 J/kg K Specific heat of solid (Cp,s) 1150 J/kg K Latent heat of fusion (Lf) 3.87 × 105 J/kg Thermal conductivity of liquid (λl) 90 W/m K Thermal conductivity of solid (λs) 120 W/m K Liquidus temperature (Tl) 911 K Solidus temperature (Ts) 864 K Heat transfer coefficient (hconv) 20 W/m2 K radiation emissivity 0.3 Surface tension (γ0) 0.871 N/m Surface tension gradient (dγ/dT) -0.155 × 10-3 N/m K