Abbreviations/symbols/letters	Meaning
CW	Continuous Wave
P	Laser power
V	Welding Speed
Wt	The top weld width
Du	The underfilling depth
Wb	The bottom weld width
σ	Surface tension coefficient
α	Contact angle of the solid-liquid interface
ρ	Density of the liquid melt
g	Gravitational acceleration
h	Plate thickness