Cutting current: It is the most important cutting process parameter, which directly determines the thickness and speed of the cutting, that is, the cutting ability. Affect:
1. As the cutting current increases, the arc energy increases, the cutting ability increases, and the cutting speed increases accordingly;
2. The cutting current increases, the arc diameter increases, and the arc becomes thicker to make the incision wider;
3. Excessive cutting current increases the thermal load of the nozzle, and the nozzle is damaged prematurely, and the cutting quality will naturally decrease, and even normal cutting cannot be performed. Therefore, the cutting current and the corresponding nozzle should be correctly selected according to the thickness of the material before cutting.
Cutting speed: The best cutting speed range can be selected according to the equipment description or determined by experiment. Due to the thickness of the material, different materials, high or low melting point, thermal conductivity and surface tension after melting, the cutting speed is also corresponding Variety. main performance:
1. A moderate increase in cutting speed can improve the quality of the cut, that is, the cut is slightly narrower, the surface of the cut is smoother, and the deformation can be reduced.
2. The cutting speed is too fast so that the cutting line energy is lower than the required value, and the jet in the cutting seam cannot quickly blow off the molten cutting melt immediately and form a large amount of back drag, accompanied by cutting slag and cutting The surface quality is degraded.
3. When the cutting speed is too low, because the cutting site is the anode of the plasma arc, in order to maintain the stability of the arc itself, the anode spot or anode area must find a place to conduct current near the slit closest to the arc, and at the same time it will flow to the jet. More heat is transferred in the radial direction, so that the incision becomes wider. The molten material on both sides of the incision gathers and solidifies at the bottom edge, forming slag that is not easy to clean, and the upper edge of the incision becomes rounded due to excessive heating and melting.
4. When the speed is extremely low, the arc may even go out due to the wide cut. This shows that good cutting quality and cutting speed are inseparable.https://www.wxsilvercoast.com/