When using the NC plasma cutting machine, in addition to the cutting groove, the common factor affecting the cutting quality is the slag hanging phenomenon. In addition, some slag and metal slag will even be firmly adhered to the metal workpiece, which is difficult to remove, greatly increasing the work volume of secondary processing. In order to effectively control the slag hanging phenomenon of CNC plasma cutting machine, we should pay attention to the following three points:

1. The cutting torch speed is too slow:

 when the cutting speed is too slow, the cutting torch arc sprayed forward by the cutting torch will form bubbly Metal Deposits - "slow slag" at the bottom of the cutting gap, which will be firmly attached to the metal and difficult to remove.

2. Too fast cutting torch speed

 when the cutting torch cutting speed is too fast, the cutting torch arc lags behind, leaving fast slag, which is easier to remove, but if you want to reduce this phenomenon, you should start from the following aspects

(1) Reduce cutting speed;

(2) Reduce the distance between cutting torch and workpiece;

(3) Increase the oxygen concentration in the protective gas. Note: hot metal is more prone to slag hanging. The slag hanging at the beginning of cutting is relatively small, and the number of slag hanging will increase with the increase of plate temperature. At the same time, compared with other metal materials, low carbon steel is easier to hang slag.

3. Wear and deformation of vulnerable parts will also cause discontinuous slag hanging.

Analysis of the causes of slag hanging in NC plasma cutting opportunity. Generally speaking, when cutting thick plates with flame, the CNC cutting machine has high surface finish without burr and slag; However, during the cutting process, if the section is prone to slag hanging due to the cutting oxygen pressure or the discomfort of the cutting nozzle accessories, the slag hanging on the upper or lower edge of the cutting section will be difficult to remove, which will not only affect the finish of the cutting surface, but also have more or less impact on the subsequent processing operations.

        1. Slag hanging on the lower edge

Phenomenon: continuous slag hanging occurs at the lower edge of the cutting section.

Reasons: A. cutting speed is too fast or too slow, the number of cutting nozzle used is too small, and the cutting oxygen pressure is too low; B. There is excess fuel gas in the preheating flame, and the steel plate surface is rusted or unclean; C. The height between the cutting nozzle and the workpiece is too high and the preheating flame is too strong.

        2. Slag hanging on the cutting section

Phenomenon: there is slag hanging on the cutting section of NC plasma cutting machine, especially in the lower half.

Cause: the alloy content is too high.