When the cutting speed is too low, since the cutting is the node of the plasma arc, in order to maintain the arc itself, the node freckles or the node area must find the conduction current around the cutting seam closest to the arc, at the same time, it will transfer more heat to the The radial direction of the jet, so the cut will be enlarged, the molten material on both sides of the cut will be extracted and solidified at the bottom edge, forming a slag that is not easy to clean, and the upper edge of the cut is a fillet formed by overheating and melting.
Therefore, good cutting quality and cutting speed are inseparable. When the speed is low, the arc even goes out because the cut is too wide.
The cutting range of the CNC portable cutting machine is mainly as follows: the cutting speed can improve the cutting quality, that is, the cutting is slightly narrower, the cutting surface is relatively flat, and the deformation can be reduced. The cutting speed is too fast to bring the cutting line energy below the desired value. The jet stream in the cut seam cannot melt the molten melt immediately, creating a lot of resistance and following the cut, when the slag hangs in the mouth, the quality of the cut surface will be reduced.