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EN
1.0
TECHNICAL DATA
CONTACT CUTTING AND DISTANCE CUTTING
Current
Duty cycle
Cutting gas
Cooling
Flow/bars
Arc striking
Harness length
In association with the power source
European Standards
This equipment is protected by the fol-
lowing patents:
Origin equipment fitted to the torch
Nozzle
Electrode
front plat skirt
2.0
GENERAL
The Sharp is obtained by the combined effect of a continuous
electric arc and a flow of gas. the thermal and kinetic energy of the
column of ionized gas, or plasma, melts the material to be cut and
ejects it from the groove.
For torch CCT 4000 CENTRAL, the gas used is compressed air,
which acts simultaneously as cooling agent and as plasma-form-
ing gas.The torch is built round the two main components which
generate the plasma:
1.
The electrode, which is the source of cathodic emission and
the root of the arc,
2.
The nozzle, which constricts and ejects the plasma and, as a
secondary function, acts as the anode during the pilot arc
phase.
3.
The different parameters are often interdependent and influ-
ence the results of the cutting operation:
4.
The diameter of the nozzle must be matched to the generator
power (current) selected.
5.
The speed of advance is applied by the operator as a function
of the thickness to be cut and the power selected. For
SHARP equipment, the nature and flow rate of the gas are
fixed from the start: the flow rate results from the feed to the
installation of compressed air at 4.5 to 5.5 bars. A reduction
of the pressure, within this adjustment band, optimizes cut-
ting of thicker materials.
6.
As a general rule, High power, selected as a function of the
thickness to be cut, enables high cutting speeds, with conse-
quent:
- reduction (or disappearance) of adherent dross,
- reduction of the "Heat Affected Zone",
- increased quantity of material removed,
- increased production of smoke.
- Increasing the power tend to increase the width of the cut.
For the SHARP - Parts may be up to 10 mm for contact cutting.
3.0
OPERATION
3.1
FITTING COMPONENTS
Choose a nozzle as a function of the type of generator, the current
range selected and the type of work to be done; choose an elec-
trode and a skirt/shoe to go with it see tables:
TECHNICAL DATA
120 A
60%
compressed air
230 l/mn – 5 bars
Break of short circuit
6 M - W000274858
15 M - W000274859
SHARP 25MC
SHARP 40MC
EN 60974-7
FR 9206760, FR 9801146 and
US 6.169.264, FR 9715751 and
US 6.147.318, FR 9816038
C 1.4 W000268224
C W000302576
W000302667
1.
The elements: Electrode (1) Nozzle (2) are fitted to the torch
using the multi-purpose wrench only and applying a moder-
ate tightening torque.
2.
Screw the skirt (3) on to the torch body; it has to be present
to validate the "Safety" function of the generator.
3.2
USE FOR CUTTING
It is possible to ignite the pilot arc in the air. Make sure not to direct
the nozzle at anyone or at anything but the object to be cut.
To ignite the arc, simply operate the safety trigger. This requires
two movements:
1.
Slide it longitudinally to unlock it
2.
Press sideways to actuate the breaker.
To start on thin parts, no special precautions are necessary: posi-
tion the torch on the workpiece, at the starting point, actuate the
trigger and piercing will be immediate; on the other hand, for thick-
er parts, there is a risk of damage from rebounding particles of
metal, to both the nozzle and the skirt. As far as possible, then,
start the cut at the edge of the sheet.
In other cases, where starting in the middle of the sheet cannot be
avoided, set a limit of not more than 1/3 of the maximum capacity
of the range. Incline the torch slightly and move it gently during the
transfer in order to allow the particles to be ejected laterally
If the results of the cut are unsatisfactory:
1.
Adapt the cutting speed to the thickness being cut,
2.
Check that the nozzle and electrode are in good condition.
3.
If necessary, choose a different power range.
To achieve a regular cutting trajectory, it is possible to press the
end of the torch against a template or rule. if a long nozzle is used
with a metal rule, be sure to interrupt the arc on leaving the work,
to prevent it from remaining ignited due to contact between the
nozzle and the rule, with risk of damage to the channel.
Before carrying out any operation on the torch, after cutting, wait
for the after-gas to finish flowing to allow the nozzle to cool. If nec-
essary, actuate the after-gas a second time to complete the cool-
ing process.
WARNING. WHEN THE ARC IS IGNITED IN THE MIDDLE OF A
WORK PIECE, PARTICLES OF METAL MAY BE EJECTED UP-
WARDS ONTO THE NOZZLE AND DAMAGE IT. TO AVOID
THIS, ORIENT THE TORCH SO THAT THE PARTICLES CAN
ESCAPE SIDEWAYS. PERFORM THE CUT, KEEPING THE
STARTING POINT IN THE WASTE.
3 EN
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