Spot Welding; Aluminium Welding; Mma Electrode Welding - CEA CONVEX 330 basic Bedienungsanleitung & Ersatzteilliste

Connect up the interconnection cables (power cable, ancillary
wiring and gas tube) to the special attachments and couplings
shown in Fig. B2.
The delivery (blue coloured) and return (red coloured) water
tubes, used for cooling the torch of the welding machine, are
part of the interconnection cable and should be connected as
follows:
• Interconnection cable on generator side: connect up tubes
to their rapid couplings (blue and red coloured) at the back
of the coolant system.
• Wire feeder side connecting cable: connect the red and
blue pipes to their respective bulkhead grommets on the
rear panel of the feeder.
2) Connect up the earthing system cable to the rapid coupling
marked by a + (positive) symbol and then the relevant ground
clamps to the piece being welded or to its support in an area
free from rust, paint and grease. Using particularly long earth-
ing cables reduces the voltage and causes some problems
from increased resistance and inductance of the cables that
could cause faulty welding. Follow instructions to avoid these
problems:
• Use earthing and extension cables with appropriate section.
• Lay out the cables as a flat as possible to prevent them
from coiling up.
3 - Welding
1) Start the welding machine by selecting position 1 on the line
switch (Pos. 3, Fig. A).
2) Make the adjustments and do the parameter settings on the
CX control panel (read the enclosed manual carefully).
3) Load the wire (see the relevant paragraph in the feeder man-
ual) using the motor test button, after having removed the wire
guide nozzle from the torch to allow the wire to come out free-
ly during loading (remember that the wire guide nozzle must
correspond to the diameter of the wire used).
4) Open the tap on the cylinder slowly and adjust the reducer
knob to obtain a pressure of about 1,3 to 1,7 bar, and then ac-
tivate the gas test button and regulate the flow to a value be-
tween 14 and 20 lit/min to suit the current used for welding.
5) The welding machine is ready to weld. Make the adjustments
and select the parameters for the feeder or, if selected, on the
CX control panel (read the enclosed manual carefully). Start
welding by moving close to the welding point and press the
torch button.
6) Once welding has been completed remove any slag, switch
off the machine (which is only to be done when the fan is not
running), and close the gas cylinder.

Spot welding

The substantial difference with MIG-MAG welding is essentially re-
lated to the torch and the adjustments that must be made on the
CX control panel.
• The gas guide nozzle specifically for spot welding must be fitted
on the torch (see Fig. C).
• Select the spot welding function on the control panel and set
the time.
To begin spot welding:
• Place the gas guiding nozzle perpendicular on the workpiece
to be spot welded.
• Press the torch button to start the welding current and wire feed.
• When the spot welding time expires, the wire feed stops auto-
matically.
• When the torch button is pushed again a new welding cycle
starts.
• Release the torch button.
FIG. C

Aluminium welding

To weld with aluminum wire proceed as follows:
• Replace the drive rolls with special ones for aluminium wire.
• Use a torch with a 3M cable and a carbon Teflon sheath.
• Set the pressure between the drive rollers at the minimum, by
turning the screw provided.
• Use argon gas at a pressure of 1,3 - 1,7 bar and regulate the
flow to a value between 14 and 20 lit/min to suit the current used
for welding.

MMA electrode welding

On the CONVEX 330-400-500 basic machine, electrode welding
is used to weld most metals (different types of steel, etc.) using
coated rutilic and basic electrodes with diameters ranging from Ø
1.6 mm to Ø 6 mm, and devices that the user can adjust for "Arc
Force", "Hot Start", and Anti-sticking functions to avoid the elec-
trodes sticking.
1) Connecting the welding cables (Fig. D):
Disconnect the machine from the mains power supply and con-
nect the welding cables to the output terminals (Positive and
Negative) of the welding machine, attaching them to the clamp
and ground with the polarity specified for the type of electrode
being used (Fig. D). Always follow the electrode manufactur-
er's instructions. The welding cables must be as short as pos-
sible, they must be near to one another, positioned at or near
floor level. Do not touch the electrode clamp and the ground
clamp simultaneously.
2) Start the welding machine by selecting position 1 on the line
switch (Pos. 3, Fig. A).
3) Make the adjustments and do the parameter settings on the
CX control panel (read the enclosed manual carefully).
4) Carry out welding by moving the torch to the workpiece. Strike
the arc (press the electrode quickly against the metal and
then lift it) to melt the electrode, the coating of which forms a
protective residue. Then continue welding at an inclination of
about 60° compared with the metal in relation to the direction
of welding.
WELDING THICKNESS (mm)
1,2 ÷ 2
1,5 ÷ 3
3 ÷ 5
5 ÷ 12
≥ 12
≥ 20
Ø ELECTRODE (mm)
1,6
2
2,5
3,25
4
5
6
FIG. D
5
Table 3
Ø ELECTRODE (mm)
1,6
2
2,5
3,25
4
≥ 5
Table 4
CURRENT (A)
30 ÷ 60
40 ÷ 75
60 ÷ 110
95 ÷ 140
140 ÷ 190
190 ÷ 240
220 ÷ 330