The surface roughness of laser cutting mainly depends on the following three aspects:

① The intrinsic parameters of the cutting system, such as spot mode, focal length, etc;

② Adjustable process parameters in the cutting process, such as power, cutting speed, auxiliary gas type and pressure;

③ The physical parameters of the processed material, such as the laser absorption, melting point, viscosity coefficient of molten metal oxide, surface tension of metal oxide, etc.

In addition, the thickness of machined parts also has a great impact on the surface quality of laser cutting. Relatively speaking, the smaller the thickness of the metal workpiece, the higher the roughness grade of the cutting surface.