During the laser cutting process, the laser head nozzle collects the capacitance signal and transmits it to the signal processor through the ceramic ring, so as to maintain the distance tracking of the laser head to the workpiece during the cutting process of the laser pipe cutting machine, guide the gas to pass through the workpiece smoothly, and form a high pressure near the nozzle outlet to accelerate the cutting speed, take away the slag, and protect the internal lens of the laser head.

I. Nozzle type

Generally, laser cutting nozzles are divided into single and double layers. Single layer nozzles are used for melting and cutting, that is, nitrogen is used as the auxiliary gas, which is usually used for cutting stainless steel, aluminum alloy, brass, etc; The double-layer nozzle is generally used for oxidation cutting, that is, oxygen is used as auxiliary gas, which is usually used for cutting carbon steel.

II. Nozzle size selection

The diameter of the nozzle determines the shape of the gas flow entering the incision, the gas diffusion area, and the gas flow rate, thus affecting the molten material removal and cutting stability.

The larger the air flow into the notch, the faster the speed, and the proper position of the workpiece in the air flow, the stronger the ability of ejecting to remove the melt. The user selects the nozzle size according to the laser power used and the thickness of the metal plate cut.

Theoretically, the thicker the plate is, the larger the nozzle should be used, the greater the setting pressure of the proportional valve, and the greater the flow. Only by ensuring the pressure, can the normal section be cut.

Three different power nozzle selection

Laser power ≤ 6000w

Cut carbon steel, and the specification and diameter of nozzle are generally double-layer S1.0-5.0E;

Cut stainless steel with ordinary WPCT single-layer nozzle;

Laser power ≥ 6000w

Cutting carbon steel, 10-25mm carbon steel bright surface cutting, the specification and diameter of the cutting nozzle are generally double-layer high-speed E-type S1.2-1.8E; Single layer fan diameter is generally D1.2-1.8;

Cut stainless steel with ordinary WPCT single-layer nozzle;