During laser cutting, a large amount of heat is generated. When such high heat is concentrated together, the material at the cutting place will burn, an oxidation reaction will occur, and the workpiece will be easily deformed. The laser cutting machine must be assisted by auxiliary gas when processing! Generally, there are three kinds of auxiliary gases that we use the most: oxygen, nitrogen, and air. The higher the purity of the gas, the better the cutting quality. When conditions permit, air-assisted cutting with a laser cutting machine is the lowest cost method. However, during the use of air-assisted cutting, there will often be water mist on the protective lens. Not only the cutting speed is slow, but the cutting quality is also poor.
First of all, let me give you the role of auxiliary gas:
1.In order to blow away the residual waste residue, to achieve the best cutting effect.
2. The gas is used to blow away the metal slag while protecting the lens, avoiding the slag to be attached to the lens, which affects the cutting quality.
3. It can effectively achieve the effect of smooth and clean cutting surface, no burr and no dross, which belongs to fine cutting.
4. It can react with the material and increase the cutting speed. For example, the effect of combustion can be achieved by using oxygen.
We should choose nitrogen when processing stainless steel. Nitrogen can prevent the oxidation reaction of the incision, so that the processed incision will not be blackened. When choosing nitrogen, choose high purity. If it is carbon steel sheet processing, oxygen must be selected. Oxygen mainly plays a role in supporting combustion. It can speed up the laser cutting processing of the workpiece. Of course, the purity of oxygen must be as high as possible. In some processing that is not very precise, we can also choose oxygen, because the use of oxygen is low in cost and has a great auxiliary effect.