Plasma profile cutting is a process that is used to cut steel and other metals using a plasma torch.
In this process, an inert gas (compressed air) is blown at high speed out of a nozzle. At the same time an electrical arc is formed through that gas from the nozzle to the surface being cut, turning some of the gas to plasma.
The plasma is sufficiently hot to melt the metal being cut and moves sufficiently fast to blow molten metal away from the cut.
The advantage of plasma cutting over the oxyfuel cutting is that oxyfuel cuts by burning, or oxidising and it is limited to steel and other ferous metals that support the oxidising process.
Metals like stainless steel and aluminium form an oxide that prevents further oxidation and thus make oxyfuel cutting imposible. Plasma cutting, however, does not rely on oxidation to work, and thus it can cut aluminum, stainless steel and any other conductive material.