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BT240S 3KW 2D Laser Cutting Head User Manual
2.2.2 Assist Gas Interface
Impurities such as hydrocarbons and water vapor in the auxiliary gas can damage the lens, and
causing cutting power fluctuations will also result in inconsistencies in the workpiece section. The
following table shows the recommended auxiliary gas specifications.
Impurity can be filtered out in gas supply tube, but oxygen and water vapor can permeate
the system through nonmetal materials, which is the source of the appearance of dust and
hydrocarbon. Stainless steel fittings are recommended, operators must use filters which can
remove a minimum of 0.01 micron particle to purify the light path system, and meanwhile, use a
filter to reduce the diameter of the particles passing through to less than 0.01 micron.
A pressure gauge with a stainless steel diaphragm is recommended. Industrial pressure
gauges suck in air. Rubber diaphragm produce hydrocarbon by aging or other factors.
CAUTION: gas interface can not be replaced arbitrarily, especially do not use PTFE TAPE,
Otherwise, the gas path will be blocked, the normal cutting will not be possible and the laser
head parts will be damaged at the same time.
Note: the gas pipeline on the customer site is likely to hide condensate water, pite tape for
joint sealing and other impurities, after valving the gas for 3-5min under the pressure of more
than 15bar, access the air pipe to the laser head.
2.3 Fiber Input Interface
BT240S is suitable for most industrial laser generators. It is equipped with a collimator assembly.
The connection between the end of the fiber and the cutting head is called fiber optic splice. The
common types of fiber optic splices include QBH,
QCS
and QD. In respect of QCS joint, BT240S
BT240S has 14mm, 24mm, 25mm, 30mm clip ring interfaces, other optical fibre splices can also fit.
Each optical fibre splice has its own unique fixing methods. Please refer to the corresponding
introduction of fiber optic splices. Figure 1 shows the installation interface of the QBH joint.
Warning: the optical device must be kept clean. All dust must be removed before use. If the
laser head is inserted vertically by the fiber, then the laser head must be rotated 90 degrees to
the horizontal position, and then insert the fiber to prevent dust from falling on the surface of
Gas
Purity
Maximum content of
water vapor(ppm
）
Maximum content of
hydrocarbon(ppm
）
oxygen
99.95%
<5 ppm
<1 ppm
nitrogen
99.995%
<5 ppm
<1 ppm
argon
99.998%
<5 ppm
<1 ppm
helium
99.998%
<5 ppm
<1 ppm
