V1.0 Shanghai Empower Technologies Co., Ltd. © Copy Right
www.empower.cn
BM111 SERIES 3KW Auto-Focusing Laser Cutting Heads User Manual
10 | 28
used equipped with external water supplied, the precondition is to meet the requirements in the
list.
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
3.2.2
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
Cutting gas pipe interface
Water-cooled interface
Water-cooled interface
Nobble-cooled gas
pipe interface
Fig 3.2 - position of water pipe and gas pipe interfaces