Cebora 359 Manual De Instrucciones página 12

3 USE
Make sure the trigger has not been pressed.
Turn the machine on using the switch C. The warning
lamp V will light to indicate that the machine is on.
By pressing for an instant the welding torch button com-
pressed air flow is opened. Under this condition set the
pressure shown by the pressure gauge F, at 5 bar (0.5
MPa) for 6 m long torches and 0.55 bar (0.55 MPa) for
12 m long torches by means of the reducer knob E, and
then lock the knob by pushing it down.
Connect the grounding clamp to the workpiece.
The cutting circuit must not be deliberately placed in di-
rect or indirect contact with the protective wire except in
the workpiece.
If the workpiece is deliberately grounded using the pro-
tective conductor, the connection must be as direct as
possible and use a wire of at least the same size as the
cutting current return wire, and connected to the work-
piece at the same point as the return wire using the re-
turn wire clamp or a second grounding clamp placed in
the immediate vicinity. Every precaution must be taken to
avoid stray currents.
3.1 CUTTING ("CUT" OPERATING MODE)
Use the knob M to select the cutting current.
Cebora CP101 welding torch:
with nozzle ø 1.2 and 45 to 60 A currents use the two
faces spacer Art. 1404.
Cebora CP161 welding torch:
With a 20 to 40A cutting current and a 0.8 mm
diameter nozzle a cut can be made by placing the noz-
zle directly on the workpiece (drag cut).
For currents higher than 40A a spring spacer or a 2-end
spacer must be used to avoid to put into direct contact
the nozzle or the nozzle protection with the workpiece to
be cut.
With the welding torch in automatic mode, keep a dis-
tance of approximately 4mm between the nozzle protec-
tion and the workpiece, as indicated in the cutting tables.
Make sure that the grounding clamp and workpiece have
a good electrical contact, especially with painted, oxi-
dized or insulated sheet metal.
Do not connect the grounding clamp to the part of the
material that is to be removed.
Press the torch trigger to strike the pilot arc.
If cutting does not begin within 2 seconds, the pilot arc
goes out; press the trigger again to re-strike it.
Hold the torch upright while cutting.
When you have finished cutting and released the trigger,
air will continue to leave the torch for approximately 100
seconds to allow the torch to cool down.
It is best not to turn the machine off until this cool-
down period is complete.
Should you need to make holes or begin cutting from the
center of the workpiece, you must hold the torch at an
angle and slowly straighten it so that the nozzle does not
spray molten metal (see fig. 2). This must be done when
making holes in pieces more than 3 mm thick.
12
In the automatic mode strictly follow the cutting tables.
When making circular cuts, we recommend using the
special compass available upon request. It is important
to remember that use of the compass may make it neces-
sary to use the starting technique described above (fig.2).
Fig. 2
Do not keep the pilot arc lit in the air when not needed,
to avoid unnecessary consumption of the electrode, swirl
ring or nozzle.
Turn the machine off when the task is completed.
3.2 GRID CUTTING (SELF-RESTART OPERATING
MODE)
Use this function to cut drilled plates or grids.
When cutting is completed, keep the knob pressed and
the pilot arc will restart automatically. Use this function
only if required, to avoid excessive wearing of the
electrode and the nozzle.
3.3 GOUGING ("GOUGE" OPERATING MODE). only
for CP161 torches.
Fig. 4
This operation makes it possible to remove defective
welds, to separate welded pieces, to prepare edges, etc.
For this operation use a 3 mm ø nozzle.
The value of the current to be used varies from 60 to 100A
depending on the thickness and quantity of material to
be removed. With the welding torch in slanted position
Fig. 3