Cebora bravo 165 combi Manual De Instrucciones página 10

It is important to make sure the machine is turned off
whenever changing the wire reel and wire roller, to prevent
the wire feed motor from starting accidentally.
Press the torch trigger (46) and release it only when the
welding wire comes out.
welding wire can cause puncture wounds.
Never aim the torch at parts of the body, other people or
metals when loading the welding wire.
Screw the contact tip (50) back on, making sure that the hole
diameter corresponds to the wire used.
Slide the tapered gas welding tip (51) on, always turning
clockwise.
4.1 CONNECTING THE GAS HOSE
The gas cylinder must be equipped with a pressure
λ
reducer and flow meter.
If the cylinder is placed on the cylinder holder of the
λ
machine, it must be held in place by the chain provided and
be of an appropriate size to avoid jeopardizing the stability
of the machine.
Connect the gas hose leaving the back of the machine to
λ
the pressure reducer only after the cylinder is in place.
Open the gas cylinder and set the flow meter to approxi-
λ
mately 8-10 lt./min.
CAUTION: Make sure the gas used is compatible with the
material to be welded.
4.2 GENERAL NOTES
Before using this welding machine, carefully read the regu-
lations CEI 26/9 or CENELEC HD 407 and CEI 26/11 or
CENELEC HD 433. Also make sure that the insulation on
cables, torch and earth cable is intact.
5 WELDING
5.1 WELDING MILD STEEL
5.1.1 With gas protection.
Either 75% ARGON + 25% CO
for welding mild steel.
Connect the cables as shown in the figure 4.
Fig.4
1010
10
or 100% CO may be used
2 2
Select the welding current by means of the rotary switch (24).
Move the torch near the welding point and press the trigger (46).
Adjust the potentiometerl (53) knob 2 until the welding is
done with a constant, continuous noise.
If the speed is too fast, the wire tends to stick to the piece and
cause the torch to skip; if the speed is too low, the wire melts
in spaced drops or the arc does not remain lit.
When you have finished welding, turn off the machine and
close the gas cylinder.
For the correct welding angle see figure 6.
5.1.2 Without gas protection.
Connect the cables as shown in the figure 5.
Fig. 5
Use only diam. 0.9 flux cored wire that complies with the
standard AWS AS.20 E71 TII or E71 TGS, suitable for use
without gaseous protection.
Connect the earth cable clamp to the workpiece.
After connecting the cables, follow the instructions given in
paragraph 5.1.1.
NOTE: For compact, well-protected welds always work from
left to right and from top to bottom.
Remove all waste after each welding operation.
For the correct welding angle see figure 6.
5.2 WELDING ALUMINIUM
The welding machine must be prepared as for welding mild
steel with gas protection, but with the following differences:
- 100% ARGON as the protection gas for welding.
- A wire having a composition suited to the base material to
be welded.
- For welding ALLUMAN: 3÷5% silicon wire
- For welding ANTICORODAL: 3÷5% silicon wire
- For welding PERALUMAN: 5% magnesium wire
- For welding ERGAL: 5% magnesium wire
Use grinding wheels and brushes specifically designed for
aluminium, and never use them on other materials.
REMEMBER that cleanliness is quality!
The wire reels must be stored in nylon bags with dehumidi-
fying packets.
For the correct welding angle see figure 6.