Cebora BRAVO Betriebsanleitung Seite 10

E- Selector switch.
Turns the machine on or off and selects the welding volt-
age ranges.
F- Selector switch.
Fine-tunes the welding voltage within the range previous-
ly selected via selector switch E.
G- Earth sockets.
Sockets to which to connect the earth cable. (Some ver-
sions have a single earth socket ).
H- Central adapter.
This is where the welding torch is to be connected.
5 WELDING
5.1 INSTALLATION
Make sure that the wire diameter corresponds to the diame-
ter indicated on the wire feeder roller, and that the selected
program is compatible with the material and type of gas. Use
wire feeder rollers with a "U"-shaped groove for aluminum
wires, and with a "V"-shaped groove for other wires.
5.2 THE MACHINE IS READY TO WELD
• Connect the earth clamp to the workpiece.
• Set the switch Eto 1.
• Remove the gas nozzle.
• Unscrew the contact tip.
• Insert the wire in the wire liner of the torch, making sure that
it is inside the roller groove and that the roller is in the correct
position.
• Press the torch trigger to move the wire forward until it
comes out of the torch.
• Caution: keep your face away from the gun tube
assembly while the wire is coming out.
• Screw the contact tip back on, making sure that the hole
diameter is the same as that of the wire used.
• Assemble the gas nozzle.
5.3 WELDING CARBON STEELS WITHOUT GAS PRO
TECTION. (only for Arts. 574 and 575).
Make sure that the cables are properly inserted on the ter-
minal board, so that the poles match correctly (only for Art.
574 and 575, see figure 4 ).
To attain well connected and protected welds, always work
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from left to right and top to bottom. Remove all waste at the
end of each welding session.
The flux-cored wire to be used is our Art. 1587, Ø 0.9mm.
5.4 WELDING CARBON STEELS WITH GAS
PROTECTION.
Make sure that the cables are properly inserted on the ter-
minal board, so that the poles match correctly (only for Art.
574 and 575, see figure 5 ).
fig.5
In order to weld these materials you must:
• Use a welding gas with a binary composition, usually
ARGON + CO2 with percentages of Argon ranging from
75% up. With this blend, the welding bead will be well join-
ted and attractive.
Using pure CO2 as a protection gas will produce narrow
beads, with greater penetration but a considerably increase
in splatters.
• Use a welding wire of the same quality as the steel to be
welded. It is best to always use good quality wires, avoiding
welding with rusted wires that could cause welding defects.
• Avoid welding rusted parts, or those with oil or grease
stains.
5.5 WELDING STAINLESS STEEL
Make sure that the cables are properly inserted on the ter-
minal board, so that the poles match correctly (only for Art.
574 and 575, see figure 5 ).
Series 300 stainless steels must be welded using a protec-
tion gas with a high Argon content, containing a small per-
centage of O2 or carbon dioxide CO2 (approximately 2%) to
fig.4
stabilize the arc.
Do not touch the wire with your hands. It is important to keep
the welding area clean at all times, to avoid contaminating
the joint to be welded.
5.6 WELDING ALUMINUM
Make sure that the cables are properly inserted on the terminal
board, so that the poles match correctly (only for Art. 574 and 575,
see figure 5 ).
In order to weld aluminum you must use:
• Pure Argon as the protection gas.
• A welding wire with a composition suitable for the base mate-
rial to be welded.