Plasma cutting machine with different working gases can cut all kinds of metals that are difficult to cut with oxygen, especially for nonferrous metals (aluminum, copper, titanium, nickel); Its main advantage is that when cutting metal with small thickness, the plasma cutting speed is fast, especially when cutting ordinary carbon steel sheet, the speed can reach 5~6 times of the oxygen cutting method, the cutting surface is smooth, the thermal deformation is small, and there is almost no heat affected zone.