Hypertherm LR2075 - Manual (Page 40)

OPERATION
LR 2075 Laser Head Instruction Manual 4-15
Is dross hard &
shiny?
Is dross brittle
& pourus?
Are parameters set to stated
specifications or to a process
used in the past?
Yes
No
No
Yes Increase oxygen pressure.
Have you cut this
material before?
Yes
No Set to closest available process parameters.
Yes
No
Decrease cutting
speed.
Yes
No
Increase nozzle
diameter.
No
Check lens for dirt
or damage.
Clean or replace.
Yes
No
Yes
Other possible causes:
– Oxygen purity
– Low grade material
– Laser mode
– Focal position
Decrease oxygen pressure.
Yes
No
Adjust focal position.
Yes
No
Decrease nozzle diameter.
No
Check lens for dirt or damage.
Clean or replace.
Yes
No
Yes
Other possible causes:
Yes
No
Yes
Is problem corrected?
Not a known
dross problem
Record new settings
and continue cutting.
Is problem corrected?
Is problem corrected?
No
Is problem corrected?
Is problem corrected?
Is problem corrected?
Is problem corrected?
Is problem corrected?
Is problem corrected?
Yes
Dross on mild steel
Correct the parameters for pressure,
assist-gas type, focal position, focal length,
cut speed, nozzle size, nozzle-to-workpiece
height and laser power
Inspect nozzle for damage to baffle,
dross adhesion, beam centering
and orifice condition.
Replace if damaged.
– Oxygen purity
– Low-grade material
– Laser mode