Difference between single-layer and double-layer nozzles

Laser nozzles are mainly divided into two types: single-layer and double-layer. There are no universal models for either type, and mismatched operating conditions will directly lead to poor batch cutting results.

Single-layer nozzles employ a single-channel airflow structure, resulting in concentrated and high-velocity airflow. They are suitable for nitrogen and compressed air assisted processes and are primarily used for thin plates of non-ferrous metals such as stainless steel, aluminum, and copper. Suitable for precision cutting of medium-thin plates, they effectively reduce kerf, prevent workpiece oxidation, ensure surface finish, and have lower operating costs. However, this nozzle is unsuitable for oxygen cutting of thick carbon steel plates, as it easily produces slag.

Double-layer nozzles employ an internal and external dual-channel structure, providing uniform and stable airflow. They are the standard for oxygen cutting of carbon steel, efficiently removing slag and reducing burrs. Suitable for high-precision cutting of medium-thick carbon steel plates and thick stainless steel plates. This nozzle is sensitive to beam coaxiality and cutting height. After replacement, the beam spot must be calibrated to center; otherwise, problems such as beveled edges and unstable perforation may occur, affecting the stability of batch cutting.