Raytools BM110 Series - 2.2.2 Assist gas interface

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BM110 SERIES (Chinese Model) 3.3KW Auto Focus Laser Cutting Head-User Manual
6 | 20
Cooling water pipe diameter
(outside diameter)
6mm
Minimum flow speed
1.8 l/min(0.48gpm)
Entry pressure
170-520kPa(30-60 psi)
Entry temperature
≥room temperature /＞dew point
Hardness (relative to CaCO3)
＜250mg/liter
PH range
6 to 8
Particles size available
Diameter less than 200 microns
2.2.2 Assist gas interface
The impurities in cutting gas such as hydrocarbons and water vapor can damage the lens and cause
laser power fluctuation as well as inconsistencies between the sections of the work piece. The
following table is the recommended cutting gas specifications. The higher the purity of the gas, the
better the quality of the cutting section.
Impurities can be filtered out in gas supply tube, but Oxygen and water vapor can permeate light
path through non-metallic materials, which is the source of the appearance of dust and
hydrocarbons. Stainless steel fittings are recommended, at the same time customers must use
filters which can remove a minimum of 0.01micron particle to purify.
We recommend customers to use the pressure gauges with stainless steel diaphragm. Industrial
pressure gauges suck in air. Rubber diaphragm produces hydrocarbons by aging or other factors.
Cutting gas
Purity
Maximum content of
water vapor
Maximum content of
hydrocarbon
oxygen
99.95%
<5 ppm
<1 ppm
nitrogen
99.99%
<5 ppm
<1 ppm
argon
99.998%
<5 ppm
<1 ppm
helium
99.998%
<5 ppm
<1 ppm
Tracheal tube diameter specification
Fig 2.2 - position of water pipe and gas pipe interfaces