Air: Air can be directly provided by an air compressor, so it is very cheap compared to other gases. The main applicable materials are aluminum, aluminum alloy, rust copper, brass, electroplated steel, non-metals, etc. However, when the quality requirements of the cutting products are high, aluminum, aluminum alloy, stainless steel, etc. are not suitable for air because air will oxidize the parent material.
Nitrogen: When cutting some metals, oxygen will form an oxide film on the cutting surface. Using nitrogen can prevent the oxide film from appearing without oxidation. The main applicable plates are stainless steel, electroplated steel, brass, aluminum, aluminum alloy, etc.
Oxygen: Mainly used for laser cutting of carbon steel. While using the heat of oxygen reaction to greatly improve the cutting efficiency, the generated oxide film will increase the beam spectrum absorption factor of the reflective material. The cut end face is black or dark yellow. It is mainly suitable for rolled steel, rolled steel for welding structure, carbon steel for mechanical structure, high tension plate, tool plate, stainless steel, electroplated steel plate, copper, copper alloy, etc.
Argon: Argon is an inert gas. It is used to prevent oxidation and nitridation in laser cutting machine cutting. It is also used in welding. Compared with other processing gases, it is expensive and increases the cost accordingly. The cut end face is white. The main applicable materials are titanium, titanium alloy, etc.