• Check the condition of the electrode. If the end has a crater-like appearance, replace it
along with the nozzle. The maximum wear depth of the electrode is approximately .062”. A
green and erratic arc will indicate definite electrode failure and the electrode should be
replaced immediately.
• Replace the nozzle when the orifice exit is eroded away or oval shaped.
Pilot arc discussion
The CUT has a smooth, continuous pilot arc. The pilot arc is only a means of transferring
the arc to the workpiece for cutting. Repeated pilot arc starts, in rapid succession, is not
recommended as these starts will generally reduce consumable life. Occasionally, the
pilot arc may sputter or start intermittently. This is aggravated when the consumables are
worn or the air pressure is too high.
Always keep in mind that the pilot arc is designed to transfer the arc to the workpiece and
not for numerous starts without cutting. When the pilot arc is started, a slight impulse will
be felt in the torch handle. This occurrence is normal and is the mechanism which starts
the plasma arc. This impulse can also be used to help troubleshoot a "no start" condition.
5.3 Notes for cutting operation
! WARINING BEWARE OF ELECTRIC SHOCK!
It is recommended not to ignite the arc in the air if not necessary, for it
will shorten the lifespan of the electrode and nozzle of the torch.
It is recommended to initiate the cutting from the edge of workpiece,
unless penetration is needed.
Ensure spatters fly from the bottom of workpiece while cutting. If
spatters fly from the top of workpiece, it indicates that the workpiece
can not be fully cut because the cutting torch is moved too fast or the
cutting current is too low.
Keep the nozzle slightly touching the workpiece or keep a short
distance between the nozzle and workpiece. If the torch is pressed
against the workpiece, the nozzle may stick to the workpiece, and
smooth cutting is unavailable.
For cutting round workpiece or to meet precise cutting requirement,
molding board or other assistant tools are needed.
It is recommended to pull the cutting torch while cutting.
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