Nozzles are divided into single-layer and double-layer nozzles. The single-layer nozzle has a relatively slow gas flow rate and is often used to cut stainless steel, aluminum alloy, copper and other metals. Nitrogen is often used as the auxiliary gas. The double-layer nozzle has a fast gas flow rate and is suitable for high-speed cutting. It is often used to cut carbon steel. Oxygen is generally used as the auxiliary gas. The cutting surface usually turns black due to oxidation.

Nozzle size selection:

The size of the nozzle determines the gas flow rate acting on the cutting material, thereby affecting the molten material removal. The larger and faster the air flow entering the incision is, the stronger the ability of the jet to remove molten material.

Theoretically, the thicker the sheet, the larger the nozzle should be used. However, the larger the hole diameter of the nozzle, the greater the chance that sparks from the melt will bounce upward during cutting, resulting in a shorter life span of the lens.

When the nozzle is deformed or there are melt stains on the nozzle, the cutting effect will be affected. Therefore, the nozzle should be placed carefully to avoid damage or deformation. If there is melt stain on the nozzle, it should be cleaned in time.