Generally speaking, when using CNC plasma cutting machine, the width of the slit has a certain relationship with the thickness of the cutting material. However, from the processing situation of many companies, the width of the slit is beyond this range, which seriously affects the cutting quality. Based on years of R & D and production experience of Sean CNC, the cutting width of plasma arc cutting is 1.5 to 2 times wider than the cutting width of oxygen-acetylene cutting. As the thickness of the plate increases, the cutting width also increases. For stainless steel or aluminum with a thickness of less than 25mm, it can be cut with a small current plasma arc. The straightness of the cut is very high, especially when cutting a plate with a thickness of less than 8mm, small corners can be cut, even without processing. Direct welding is difficult to obtain with high current plasma arc cutting. This provides convenience for cutting the irregular curve of the thin plate and cutting irregular holes.
The plasma arc cut surface has a melted layer of about 0.25 to 3.80 mm thick, but the chemical composition of the cut surface has not changed. For example, when cutting an aluminum alloy containing 5% of Mg, although there is a 0.25 mm thick melted layer, the composition is unchanged, and no oxides appear. If the welding surface is directly welded, a dense weld can be obtained. When cutting stainless steel, the chromium carbide will not precipitate along the grain boundary because the heated zone quickly passes the critical temperature of 649 ℃. Therefore, the use of plasma arc cutting stainless steel will not affect its corrosion resistance.
