Urrea CP1040-BV Manual De Usuario página 17

13. (Refer to parts diagram above for Torch
Handle components.)Direct torch away from
people and flammables while you squeeze (and
hold) the Torch Handle Trigger to energize the
Torch Electrode. The air output is delayed a few
seconds to enable a proper arc to begin.
CAUTION: The Torch handle is now ener-
gized. Be careful not touch anything else with
the Torch except the workpiece to be cut.
WARNING: Never look at the ignited arc
without the approved, arc shaded, eye protec-
tion in a full face shield. Permanent eye damage
or blindness can occur, also Skin burns can occur.
Never breathe arc fumes.
14. Bring the Electrode (4A) of the Torch close to
the staring point of the cut. The Working Indica-
tor Light will come on.
15. Slowly move the Torch at a slight angle along
the cutting line with the Torch tip trailing. The
air causes the molten metal to fall away from
the workpiece being cut. If proper cutting is not
achieved, adjust the Power Supply Controller to
a higher level, and/or increase air flow. To in-
crease air flow, press the Power Switch to the
Off (O) position, then adjust the air pressure at
the Air Pressure Regulator. The air will continue
for a few seconds once the trigger is released.
NOTE: If too much current is drawn from the
Plasma Cutter (i.e., short circuit),the Thermal
Switchman overload protector, will activate
and the red Thermal Overload Indicator Light
will light. The Plasma Cutter will turn off until
it cools down. To reset you must turn the power
OFF then back ON. Press the Trigger to begin
cutting again.
16. When finished cutting:
a. Release the Torch handle trigger and lift the
Torch handle from the workpiece,
b. Press the Power Switch to the Off (O) posi-
tion.
c. Set the Torch handle down on the metal
workbench,
d. Turn the air supply off,
e. Unplug the line cord from the electrical out-
let.
PLASMA CUTTING TECHNIQUE
Using a plasma cutter is a skill that requires
time and effort to do well. Practice striking and
maintaining an arc on scrap work pieces before
beginning work. This will help you gauge the
best settings for the plasma cutter for the mate-
rial at hand.
E N G L I S H •
1. You can cut metal that will conduct electric-
ity up to approximately 1/2" thick mild steel or
equivalent. Very thin or very thick metals are
more difficult to cut cleanly.
2. Generally set the air pressure between 60
and 80 psi. Increased air pressure will increase
plasma speed and cutting pressure. Air pressure
and amperage should be adjusted in tandem.
3. Generally start with a mid-range amperage
setting (32-33 amps) and adjust up or down
from there. Increased amperage will increase
cutting heat. This is needed with heavier and
harder metals. However, increased amperage
will reduce Duty Cycle time.
4. Move the cutting head more slowly for thick-
er and harder metals, and more quickly for thin
or soft metals. Keep the cutting head moving
while cutting.
HOW DO PLASMA CUTTERS WORK?
Plasma cutters work by feeding an inert gas (air)
through an electric arc. The air is then heated to
an extremely high temperature which converts
the gas to plasma which cuts the metal.
High temperature and pressure are required to
create a plasma. The electric arc provides the
temperature, and by exhausting the air through
a very small orifice, the pressure is increased far
beyond the 60-80 PSI operating pressure of the
air supply.
Plasma cutters work by sending a pressurized
gas through a small channel. In the center of
this channel, there is a negatively charged elec-
trode. When power is supplied to the negative
electrode, and the tip of the nozzle contacts the
work metal, the connection creates a circuit.
When the nozzle is lifted away, the arc will con-
tinue. As the inert gas passes through the chan-
nel, the arc heats the gas until it becomes ion-
ized. This reaction creates a stream of directed
plasma, approximately 30,000°(16,649˚C) and
moving at approximately 20,000 feet per second
(6,096 m/sec),that reduces metal to molten slag.
The plasma itself conducts electrical current. The
cycle of creating the arc is continuous as long
as power is supplied to the electrode and the
plasma stays in contact with the metal that is be-
ing cut. In order to ensure this contact, protect
the cut from oxidation, and regulate the unpre-
dictable nature of plasma, the cutter nozzle has
a second set of channels. These channels release
a constant flow of shielding gas around the
cutting area. The pressure of this gas flow ef-
fectively controls the radius of the plasma beam.
Us er 's M an u a l
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