Lincoln Electric IM10020 TOMAHAWK 625 - Manual (Page 11)

B-1 OPERATION
TOMAHAWK™ 625
B-1
SAFETY PRECAUTIONS DESCRIPTION
The TOMAHAWK™ 625 is a constant current, contin-
uous control plasma cutting power source. It provides
superior and reliable starting characteristics, cutting
visibility and arc stability. The control system has a
safety mechanism to insure that the nozzle and elec-
trode are in place before cutting or gouging. This is
extremely important due to the high voltages involved.
The TOMAHAWK™ 625 comes standard with an air
regulator and pressure gauge. The machine also
comes with an input power cord, Hand-held torch with
a 20' cable length. Consumables are included with
each TOMAHAWK™ 625 purchase so that cutting can
begin right out of the box. Consumables can also be
ordered as individual packages.
The TOMAHAWK™ 625 initiates the plasma arc with
a simple, yet reliable, touch start mechanism. This
system eliminates many of the failure problems asso-
ciated with hi-frequency start systems.
PREHEAT TEMPERATURE FOR
PLASMA CUTTING
Preheat temperature control is not necessary in most
applications when plasma arc cutting or gouging.
Preheat temperature control may be necessary on high
carbon alloy steels and heat treated aluminum for crack
resistance and hardness control. Job conditions, pre-
vailing codes, alloy level, and other considerations may
also require preheat temperature control. The following
minimum preheat temperature is recommended as a
starting point. Higher temperatures may be used as
required by the job conditions and/or prevailing codes.
If cracking or excessive hardness occurs on the cut
face, higher preheat temperature may be required. The
recommended minimum preheat temperature for plate
thickness up to 1/2" (12.7mm) is 70°F (21.1°C).
ELECTRIC SHOCK
can kill.
• Do not touch electrically live parts
or electrode with skin or wet
clothing.
• Insulate yourself from work and
ground.
• Always wear dry insulating
gloves.
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
WELDING, CUTTING and
GOUGING SPARKS
can cause fire or explosion
• Keep flammable material away.
• Do not weld, cut or gouge on
containers that have held combustibles.
Observe additional Safety Guidelines detailed in
the beginning of this manual.
WARNING
ARC RAYS
can burn.
• Wear eye, ear and body
protection.
PLASMA ARC
can injure
• Keep your body away from nozzle
and plasma arc.
• Operate the pilot arc with caution. The
pilot arc is capable of burning the
operator, others or even piercing
safety clothing.