Laser cutting nozzle Raytools, Boci , Precitec ,WSX head

Nozzle Type Selection:

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 an 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 and generally uses oxygen as the auxiliary gas.

An experienced operator can make other nozzle sizes work well with a different combination of feed rate, laser power, and assist gas pressure. 

Here are some different tips for choosing a laser nozzle: orifice size, chrome or non-chrome plating, single or double nozzle, and the surface area of the nozzle near the cutting area. In some cases, there are also options for internal shapes that affect the assist gas flow, such as conical or cylindrical.

You will see more and more nozzles with chrome plating, which helps further extend the span life of the nozzle. The chrome finish provides a harder surface that is more durable and has a stronger resistance to metal spatter. 

The below table is a guide for you to choose the right nozzle
 

Name	Code	Shape	Features	Application
Single nozzle	"S"Single nozzle		The inner is conicalHigh-pressure gas and blowing slags with a higher  flow rate	Air or oxygen cutting for: stainless steel, galvanized sheet, aluminum sheet and other materials
Double nozzle	"D"Double nozzle		Double-layer compositedBased on the  single-layer,Added an inner core	OxygenCutting for: (double layer 2.0 size and above )for carbon steel sand surface cutting
High speed double nozzle	DE nozzle		The nozzle tip is sharped. The three holes on the inner core edge are larger than the ordinary double-layer nozzle	OxygenMainly used for high-power and high-speed bright surface cutting of carbon steel less than 20mm
High speed Single nozzle	SP nozzle		The nozzle tip is sharped. And the inner is a stepped cone	Mainly used for high-power, high-speed bright surface cutting or oxygen negative focus cutting of carbon steel with a thickness  less 20 mm
High speed Single nozzle	ST nozzle		The nozzle tip is  sharped and has a conical inner . The nozzle's caliber  is larger than SP nozzle.	Mainly used for high-speed bright surface cutting of carbon steel with a thickness of more than 20m.
Pressurizing nozzle	Boost nozzle		Based on single-layer nozzleThe nozzle  has a step	Mainly used for high power nitrogen or air low pressure cutting of stainless steel and carbon steel.

Different cutting materials requirements: 

The single-layer nozzle is mainly used for nitrogen cutting of stainless steel and aluminum plates; The double-layer nozzle is mainly used for oxygen cutting of carbon steel.

Nozzle's Caliber: 

The caliber size of the nozzle determines the flow rate of the gas and the shape of the gas field. Generally, when cutting thin plates less 3mm, it is recommended to use a nozzle with a caliber of 1mm, and a nozzle with a caliber of 1.5mm is recommended for cutting 3-10mm and more than 10mm caliber is 2mm or more.