In Thick Metal Fiber Laser Cutting Machine,the heat input by the light beam (converted by light energy) far exceeds the part reflected, conducted or diffused by the material, and the material is quickly heated to the vaporization temperature and evaporates to form a hole. With the relative linear movement of the beam and the material, the hole continuously forms a slit with a very narrow width (such as about 0.1mm). The heat effect of trimming is very small, and there is basically no deformation of the workpiece. During the cutting process, an auxiliary gas suitable for the material to be cut is added. When cutting steel, oxygen must be used as the auxiliary gas to produce an exothermic chemical reaction with the molten metal to oxidize the material, and at the same time help blow away the slag in the slit. Compressed air is used to cut polypropylene and other plastics, and inert gas is used to cut flammable materials such as cotton and paper. The auxiliary gas entering the nozzle can also cool the focusing lens, preventing smoke and dust from entering the lens holder to contaminate the lens and cause the lens to overheat.This is the principle of Thick Metal Fiber Laser Cutting Machine.