In Jinan metal laser cutting, if the nozzle is not selected or maintained properly, it is easy to cause pollution or damage, or due to poor roundness of the nozzle mouth or local blockage caused by splashing of molten iron, eddy currents will form inside the nozzle, leading to significantly poor cutting performance.
Firstly, the nozzle mouth and the focusing beam have different axes, forming a beam to cut the nozzle edge. This also affects the cutting quality, increases the cutting width, and causes the cutting size to be misaligned.
The size of the nozzle has a certain impact on the cutting speed, and the size of the nozzle also has an impact on the outlet pressure distribution. With the increase of nozzle diameter, the Heat-affected zone will become narrower due to the strong cooling effect of the jet on the base metal in the cutting area, but it will also lead to the cutting seam being too wide, and the nozzle size will cause difficulties in alignment. There is a risk of cutting the nozzle mouth by a beam of light. Moreover, narrow slits can hinder the smooth progress of high-speed slag discharge.
The distance between the nozzle and the workpiece directly affects the coupling between the nozzle airflow and the workpiece slit. If the nozzle mouth is too close to the surface of the workpiece, it will generate strong reflux pressure on the lens, weaken the dispersion ability of splashing cutting material, and have a negative impact on cutting quality. However, if the distance is too far, it will cause unnecessary kinetic energy loss, which is not conducive to effective cutting.