When using the water mist CNC plasma cutting machine to cut stainless steel plates, due to the characteristics of stainless steel itself, we should not use some of the original cutting experience of ordinary carbon steel plates to copy to the stainless steel plasma cutting work. Should appropriately increase the cutting current, increase the compressed air pressure, and reduce the cutting speed of the CNC plasma cutting machine. If the cutting effect is more demanding, inert gas such as nitrogen can be used for protection.

When using thermal cutting processing methods, a very common problem is the slag of the cutting surface, which is the problem of cutting flatness that we will talk about. As for the water mist CNC plasma cutting machine, similar situations still exist. At the same time, considering that the current water mist plasma cutting machine is mainly used for cutting and processing special materials such as stainless steel, the molten slag treatment is more difficult than that of carbon plates. For some finishing companies or users who want to reduce secondary processing, how to reduce the residue of molten slag and improve the quality of cutting flatness is believed to be the concern of many companies.

In order to improve product quality and taste, more and more companies use stainless steel plates in their products, such as kitchenware, cooking utensils and other products. The use of stainless steel plates will inevitably encounter problems with the cutting and processing of stainless steel plates. At present, the main cutting and processing methods for stainless steel plates include: laser cutting, water mist plasma cutting, water mist punching, etc.

Different processing methods will differ in terms of processing thickness, processing speed, processing quality and processing cost. Generally speaking, the laser processing effect is very good, and it is more suitable for stainless steel sheet cutting processing, and the equipment purchase cost and processing cost are high. The processing effect of the water mist punch is second, and the equipment purchase cost is between the laser cutting machine and the water mist plasma cutting machine. The effect of plasma cutting is general, the cutting edge will be slightly discolored, the processing speed is faster, the purchase cost of the equipment and the processing cost are relatively low, and it is more suitable for occasions where the cutting effect is not high.

From the literal meaning, the so-called flatness of the cutting surface refers to the distance between two parallel lines on the cutting surface of the measured part and the relatively low point, in the direction of the inclination of the cutting surface.

Generally speaking, the cutting surface processed by the water mist CNC plasma cutting machine has a melting layer of about 0.25-3.80mm thick. The residual chemical composition of the molten slag of this thickness is consistent with the material itself, including the chemical composition of the cut surface. No change. For example, when we cut and process magnesium-containing aluminum alloys, if the magnesium metal content is 5%, after the residual analysis of the slag, the magnesium content in its composition will remain unchanged, even if the residual thickness of the slag reaches 0.25mm, it does not appear. There are oxides. If the cut surface is used for welding directly, a dense weld can also be obtained. When cutting stainless steel, because the heated zone quickly passes the critical temperature of 649°C, chromium carbide will not precipitate along the grain boundaries. Therefore, cutting stainless steel with plasma arc will not affect its corrosion resistance. In other words, the residue of molten slag in the allowable range does not affect the physical properties of the cutting material. It is just to reduce the thickness of the molten slag. It can be achieved by adjusting the working gas pressure of the water mist CNC plasma cutting machine and the walking speed of the cutting torch.