No matter how to adjust the cutting process, the phenomenon of cutting surface groove will appear when using CNC plasma cutting machine. Below, I will give you a detailed answer:

Because the shape of plasma arc is spindle. When the cutting height is too high or too low, it will cause groove. When using the CNC plasma cutting machine with arc voltage regulator, as long as the arc voltage setting is adjusted, the degree of groove can be basically reduced. American Hypertherm power supply and China huayuan plasma power supply have cutting parameters for reference.    

When the cutting thickness exceeds a certain value, plasma cutting will inevitably cause a certain groove. This value is used to distinguish the quality cutting thickness of plasma power supply from the maximum cutting thickness. Once this value is exceeded, the larger part of the arc below the plasma arc will act on the steel plate cutting section to form a groove. Similarly, if the distance between the plasma cutting nozzle and the steel plate is too large, the phenomenon of groove will also occur.

Another factor that may cause the groove is the air pressure. When the air pressure is too low, the air pressure generated at the cutting nozzle is not enough to completely break through the steel plate, resulting in unsmooth cutting and even groove under the end face.    

The third factor is that the plasma nozzle of CNC plasma cutting machine is damaged. During the generation process, the plasma arc will offset and deform to the side where the nozzle is damaged, which will also form a groove on the steel plate section.

Jinan rebound CNC Machine Co., Ltd. specializes in producing CNC plasma cutting machine, CNC optical fiber laser cutting machine, CNC optical fiber laser welding machine and CNC optical fiber laser derusting machine. If you don't understand the cutting machine, please feel free to consult us.