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Nozzle

Layer
Quantity:

Nozzles are found on the Laser head on the fibre laser. There are 2 parameters you must look at when purchasing a nozzle; the layer and the caliber.

General rule for selecting the Caliber:

Material Thickness  (mm) Nozzle Diameter (mm)
<3 ~1.5
3-10 ~2
>10 ~2.5

 

General rule for selecting the Layer:

Layer Type Auxiliary Gas Material
Single Air or Nitrogen Galvinised Steel, Stainless Steel
Double Oxygen Carbon Steel, Aluminium

*These rules are used as a guide only. Individual results may vary.

 

REASONING:
Nozzle's come in either single or double layers. The layer is in reference to what gas you will primarily be using to perform the cut; Air, Oxygen or Nitrogen. The gas you are using is dependant on what type of metal you look to cut.

When using Air or Nitrogen you would commonly use a single layer nozzle.
However, when using Oxygen as your primary gas you would use a double layer nozzle. 

 

The Nozzle's caliber directly effects the gas flow velocity. Smaller diameter's will result in a higher gas flow velocity which will reduce the level of molten debris. Larger Diameters will result in a lower gas flow velocity but is less effective at removing molten debris.