In the process of laser cutting the reason for changing the distribution of total pressure in the air

In the process of laser cutting, auxiliary gas pressure have great influence on the results of cutting. In order to avoid the high-speed airflow adverse reactions of cutting function, can imagine change the distribution of total pressure in the air, because air pressure distribution of the change, make the melting process in the low pressure area; And its adjacent high near to progress enough momentum ( Momentum) To ensure more effectively remove slag. Auxiliary gas must have enough pressure to be able to completely clear the cutting waste residue, general when cutting thick workpiece pressure to reduce a little, stick to the workpiece on the residue will damage the cutting edge. Had an average pressure and temperature in gas, can cause the change of airflow field density. Such a density gradient caused internal refractive index change to dry properly focused beam energy, focus or beam divergence. Because of the intermittent high speed of light will not cause interference, melting efficiency is also progress in advance can increase the gas pressure cutting speed, but after reaching a big value, inheritance instead of increase the gas pressure can lead to decline in cutting speed. Make the light is too large, and even can't effectively cut the severe consequences. With aid of the high gas pressure, the reason of lower cutting speed in addition to boil down to the high air velocity on and hang a district enhanced cooling effect, also may be intermittent shock waves that exist in the air of district cooling the action of the laser interference. This kind of interference may affect the melting efficiency, sometimes may change the model structure, led to the decrease of the quality of the cutting, if the beam divergence too hard.