Plasma cutting machine has the advantage of plasma arc energy is more concentrated, higher temperature, faster cutting speed, small deformation, but also cutting stainless steel, aluminum and other materials. The lack of plasma cutting arc is strong, noisy, dusty, a certain degree of pollution on the environment, the thickness of a lot of underwater plasma cutting, cutting thickness also has certain restrictions. Similarly, the gas flow, arc length, telegraph quality, current size, cutting speed will affect the quality, not good grasp is not buried, flame cutting is not as simple. Plasma cutting gun should not be more, because of cutting faster, susceptible to the above factors appear inconsistent, so that cutting quality is not the same. In general, the sheet cutting, plasma cutting incision surface quality is better than the fire filling survey, and the dross is very small.