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During the work of the laser cutting machine, the gas pressure of the auxiliary gas has a great influence on the result of the cutting. The auxiliary gas must have enough pressure to completely clear the laser cutting waste. Generally, the pressure should be reduced a little when cutting a thick workpiece. The residue that adheres to the workpiece will destroy the cutting edge.
Increasing the gas pressure can advance the laser cutting speed, but after reaching a maximum value, continuing to increase the gas pressure will cause the cutting speed to decrease. Under high auxiliary gas pressures, the reason for the lower cutting speed is not only due to the increase in the airflow velocity pair and the cooling effect of the hanging zone, but also the interference of the intermittent shock wave in the gas flow to the cooling of the laser application zone. Uneven pressures and temperatures in the air flow can cause changes in the airflow field density. Such a density gradient results in a change in the refractive index within the field, thereby converging the focus of the beam energy, causing refocusing or beam divergence. This interference can affect the melting efficiency, and sometimes it can change the mode structure, resulting in a decline in the quality of the cut if the beam diverges too much. Making the spot too large may even result in serious consequences of inefficient cutting.
In order to avoid the adverse reaction of high-speed airflow to the laser cutting performance, it can be envisaged to change the total pressure distribution within the airflow. Because of this change in the pressure distribution of the airflow, the melting process takes place in the central low pressure area; and the surrounding high pressure areas around it can increase. Sufficient momentum (impact) to ensure more effective removal of slag. Due to the intermittent nature of the high pressure zone, there is no interference with the speed of light and the melting efficiency is also increased.
Editing: kunshanwl