Lincoln Electric IM10020 TOMAHAWK 625 - Manual (Page 18)

B-8 OPERATION B-8
Suggestions for Extra Utility from the
TOMAHAWK™ 625 System:
1. Occasionally an oxide layer may form over the tip
of the electrode, creating an insulating barrier
between the electrode and nozzle. This will result
in the tripping of the TOMAHAWK™ 625's safety
circuit. When this happens turn the power off,
remove the nozzle and electrode and use the elec-
trode to rub against the inside bottom surface of
the nozzle. This will help remove any oxide
buildup. Replace the nozzle, turn on the power and
continue cutting. If the safety circuit continues to
trip after cleaning the consumables, then replace
them with a new set. Do not continue to try and
cut with excessively worn consumables as this can
cause damage to the torch head and will degrade
cut quality. Do not allow torch cable or body to
contact hot surface.
2. To improve consumable life, here are some sug-
gestions that may be useful:
• Make sure the air supply to the TOMAHAWK™
625 is clean and free of oil. Use several extra in
line filters if necessary.
• Minimize dross buildup on the nozzle tip by
starting the cut from the edge of the plate when
possible.
• Pierce cutting should be done only when nec-
essary. If piercing, angle torch about 30° from
the plane perpendicular to the work piece,
transfer the arc, then bring the torch perpendic-
ular to the work and begin parallel movement.
• Reduce the number of pilot arc starts without
transferring to the work.
• Reduce the pilot arc time before transferring to
the work.
TOMAHAWK™ 625
ELECTRIC SHOCK CAN KILL.
• Turn off machine at the disconnect
switch on the rear of the machine
before tightening, cleaning or replacing
consumables.
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WARNING
• Set air pressure to recommended setting. A
higher or lower pressure will cause turbulence
in the plasma arc, eroding the orifice of the
nozzle tip.
• Use only Lincoln consumable parts. These
parts are patented and using any other replace-
ment consumables may cause damage to the
torch or reduce cut quality.