Due to the large range of materials processed by the CNC plasma cutting machine, in order to reduce the amount of slagging when cutting materials of different materials, the appropriate gas flow and cutting speed should be selected in the use and operation of the plasma cutting machine. If the gas flow is too small, the blowing force is not enough, and it is easy to produce melted nodules. When other conditions remain unchanged, as the gas flow rate increases, the quality of the incision is improved, and an incision without fusibility can be obtained. However, the excessive gas flow causes the plasma arc to be shorter, which makes the melting ability of the plasma arc to the lower part of the workpiece worse, and the drag after slitting increases, and the slit is V-shaped, but it is easy to form a welding nodule. Ensure that the plasma arc has sufficient power. The plasma arc power is increased, that is, the plasma arc energy is increased, and the arc column is elongated, so that the temperature of the molten metal during the cutting process is increased and the fluidity is good. At this time, the molten metal is easily blown off under the action of the blowing force of the high-speed airflow. Increasing the power of the arc column can improve the cutting speed and the stability of the cutting process, making it possible to use a larger air flow to enhance the blowing force of the air flow, which is very beneficial to eliminate the incision weld.
During the cutting process of the CNC plasma cutting machine, the concentricity of the electrode and the nozzle is ensured. Poor alignment of the electrode and the nozzle will cause the symmetry of the gas and the arc to be destroyed, so that the plasma arc cannot be compressed well or the arc is blown, the cutting ability is reduced, the incision is not symmetrical, and the welding nodules increase. The double arc prevents the cutting process from proceeding smoothly.