Helvi PC 73 Manual De Uso Y Manutención página 20

Equipo de corte por plasma inverter trifasico
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CUTTING
A. Cutting with a Hand Torch
The torch can be comfortably held in one hand or steadied
with two hands. Choose the technique that feels most
comfortable and allows good control and movement.
Position the index finger or thumb to press the control
switch on the torch handle.
For edge starts, hold the torch perpendicular to the
workpiece with the front of the tip on the edge of the
workpiece at the point where the cut is to start. - Fig. A.
For piercing, angle the torch slightly to direct sparks away
from the torch until the pierce is complete. Fig. B
For drag cuts keep the torch in contact with the workpiece.
For standoff cutting, hold the torch 2-3 mm from the work.
With the torch in starting position, press the control switch.
After an initial gas purge (pre-air), the pilot arc will come
on and remain on for 3 seconds until the cutting arc starts.
Once on, the main arc remains on as long as the control
switch is held down, unless the torch is withdrawn from
the work or torch motion is too slow. Keep moving while
cutting. Cut at a steady speed without pausing. Maintain
the cutting speed so that the arc lag is about 30° behind
the travel direction. Fig. C
If the cutting arc is interrupted, and the torch trigger is still
pressed, the pilot arc comes back on automatically for 3 seconds.
To shut off the torch simply release the control switch. When the switch is released a post-flow
will occur. If the torch trigger is pressed during the post-flow, the pilot arc will restart.
B. Piercing with a Hand Torch
Note: Recommended maximum piercing capacity is 2mm. If necessary to make a cut on a
metal sheet with a tickness more than 2mm without an edge start, make a hole ø 6mm at
least using an electric drill to start cutting.
When piercing with a hand torch, tip the torch slightly
so that blowback particles blow away from the torch tip
(and operator) rather than directly back into it. Fig. B
Complete the pierce off the cutting line and then continue
the cut onto the line. Hold the torch perpendicular to the
workpiece after the cut is complete. Fig. D
Clean spatter and scale from the shield cup and the tip as soon as possible. Spraying or dipping
the shieldcup in anti-spatter compound will minimize the amount of scale which adheres to it.
C. Grates Cutting
Push the Griding Function Selection Button (12) to set unit for griding cutting.
WARNING
Disconnect primary power at the source and wait that the torch has cooled before disassembling the
torch or torch leads. Frequently review the Important Safety Precautions at the front of this Manual.
Be sure the operator is equipped with proper gloves, clothing, eye and ear protection. Make sure no
part of the operator's body comes into contact with the work piece while the torch is activated.
CAUTION
Sparks from the cutting process can cause damage to coated, painted, and other surfaces such as
glass, plastic and metal.
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Fig. A
Fig. B
Fig. C
Fig. B
Fig. D

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