24/37
ALFA IN a.s ©
www.alfain.eu
Fig. 11 Cutting
Fig. 12 Cutting in the corner
IMPORTANT RULES
1. The pilot arc burning time should be limited only to the time necessary. It
lowers the wear of the cutting tips and electrodes.
2. Never turn off the main switch immediately after finishing cutting but always
leave time to run cooling cycle to cool down the torch. Immediate turn-off only
in case of emergency.
3.
Ensure a good el. contact of the work lead clamps and cutting material.
4. Check and timely exchange cutting tips and the electrodes. Lifetime of these
parts is only a few hours of cutting time and is highly dependent on
compliance with the principles of good cutting.
5.
Disconnect the machine from the mains before replacing the torch
consumable parts.
6.
Unplug the machine from the mains before any intervention inside the
machine.
7. Imperfect capture of condensate would cause its elimination in the area of the
cutting tip and it would prevent ignition of the pilot arc.
10. SOURCES OF POOR QUALITY CUTS
SHALLOW PENETRATION OF THE CUT
1. The cutting speed is too high. Make sure the slope of the cutting arc does not
exceed about 15° (see Fig. 13).
2. High wear of the cutting tip or electrode (see Fig. 14)
3. Too large thickness of material and not adequately chosen value of current
and diameter of the cutting tip.
4. Bad contact between the work lead clamps and material.
Note
If the cutting arc does not penetrate the material perfectly, the sprayed material
clogs the torch nozzle and reduces its service life.
CUTTING ARC IS UNSTABLE, GOES OFF AND “SHOOTS”
1. Worn cutting tip or electrode
2. High air pressure
3. Polluted air
