Good results can be obtained when the material is cut with oxygen. When oxygen is used as the processing gas, the cutting edge will be slightly oxidized. For plates with thickness up to 4mm, nitrogen can be used as processing gas for high-pressure cutting. In this case, the cutting edge will not be oxidized. When the thickness of the plate is more than 10 mm, it can get a better effect by using a special plate for laser and coating oil on the surface of the workpiece during processing.