1.The air can be supplied directly by the air compressor, so it is very cheap compared with other gases. Although air contains about 20% oxygen, its cutting efficiency is far less than that of oxygen, and its cutting ability is similar to nitrogen. Trace oxide film may appear on the cutting surface, but it can be used as a measure to prevent the film from falling off. The end face of the cut is yellow.

2. Nitrogen, oxygen is used in cutting of some metals to form oxide film on the cutting surface. No oxidation cutting surface can be directly welded, daubed, strong corrosion resistance and other characteristics. The end face of the cut is white.The main applicable plates are stainless steel, electroplated steel, brass, aluminum, aluminum alloy and so on.

3. Oxygen, mainly used for cutting carbon steel with laser cutting machine. While using the heat of oxygen reaction to greatly improve the cutting efficiency, the oxide film produced will improve the spectral absorption factor of the reflected material. The end face of the cut is black or dull yellow.It is mainly used for rolling steel, rolled steel for welding structure, carbon steel for mechanical structure, high tension plate, tool plate, stainless steel, electroplated steel, copper, copper alloy, etc.

4. Argon, argon is an inert gas, used to prevent oxidation and nitrification in laser cutting machine cutting, also used in welding, compared with other processing gas, the price of japonica rice, corresponding increase in cost. The end face of the cut is white.