The selection of cutting process parameters of pipe CNC plasma cutting machine is very important to cutting quality, cutting speed and efficiency. In order to correctly use the CNC plasma pipe cutting machine for high-quality rapid cutting, it is necessary to deeply understand and master the cutting process parameters.  

1、 Plasma Cutting current

It is an important cutting process parameter, which directly determines the cutting thickness and speed, that is, the cutting ability. The larger the cutting current, the higher the cutting capacity, the faster the cutting speed, the wider the cutting mouth, the faster the damage speed of the cutting nozzle and the higher the cost. Therefore, the cutting current should be selected correctly according to the thickness of the material before cutting.

2、 Plasma Cutting speed

The cutting speed range can be selected according to the equipment description or determined by test. Due to the thickness of materials, different materials, melting point, thermal conductivity and surface tension after melting, the cutting speed also changes accordingly. The speed directly affects the cutting quality, and the higher and lower are not good.

3、 Plasma Arc voltage

It is generally considered that the normal output voltage of the power supply is the cutting voltage. Plasma pipe cutting machine usually has high no-load voltage and working voltage. When the current is constant, the increase of voltage means the increase of arc enthalpy and cutting ability. If the diameter of the jet is reduced and the gas flow rate is increased while the enthalpy is increased, faster cutting speed and better cutting quality can often be obtained.  

4、 Nozzle height

It refers to the distance between the nozzle end face and the cutting surface, which forms a part of the whole arc length. Because the arc cutting of NC plasma pipe cutting machine generally uses the power supply with the characteristics of constant current or steep drop, the change of current is very small after the nozzle height increases, but it will increase the arc length and lead to the increase of arc voltage, so as to improve the arc power; But at the same time, it will also increase the arc length exposed to the environment and the energy lost by the arc column.  

Under the combined action of the two factors, the effect of the former is often completely offset by the latter, which will reduce the effective cutting energy and reduce the cutting capacity. It usually shows that the blowing force of the cutting jet is weakened, the residual slag at the lower part of the incision is increased, and the fillet appears due to over melting at the upper edge.  

We master the operation skills of the above three-point CNC plasma pipe cutting machine, which is very helpful for your cutting work.