Elettro 207 Manuel D'instructions page 8

N.B. : To reach the voltage changer, remove the
fixed housing (37).
Important: Before changing voltage make sure that
the machine is no more connected to the mains.
WARNING: ELECTRIC SHOCK CAN KILL!
Do not touch live electrical parts.
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Do not touch the weld output terminals when the unit
−
is energised.
Do not touch the torch or electrode holder and the
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work clamp at the same time.
ATTENTION: The green/yellow wire of the input power
cable must always be connected to the protection lead
(ground of the system). The yellow/green wire must
NEVER be combined with another phase wire for
drawing voltage.
2.4 CONNECTING THE GAS HOSE
WARNING: CYLINDERS
DAMAGED!
Keep the cylinders in a place where they cannot be
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damaged.
Do not lift the machine with the cylinder on its
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support.
Never touch the cylinder with the welding wire.
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Keep the cylinder away from the welding area and
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uninsulated electric circuits.
Cylinders containing inert gas have to be equipped
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with a regulator and a flowmeter.
After having positioned the cylinder, connect the gas
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hose that comes out from the rear of machine to the
pressure regulator.
Turn the gas cylinder on and adjust the flowmeter to
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approx. 8-10 litre/min.
ATTENTION: Make sure that the gas used is compatible
with the material to be welded.
2.5 UNIT DESCRIPTION (Fig.1)
A) ON-OFF switch.
B) Potentiometer for the linear adjustment of the wire
speed.
C) Connection for connecting the welding torch.
D) Earth cable connection.
E) Voltage adjustment switch.
F) Thermostat pilot light.
G) Main ON/OFF indicator lamp.
H) Electronic spot-weld time adjustment.
I) Rough voltage adjustment switch.
6
CAN EXPLODE IF
2.6 GENERAL NOTES
Before using this welding machine, carefully read the
CEI Standards 26/9 or CENELEC HD 407 AND CEI
26/11 or CENELEC HD 433, also check for insulation of
cables, torch and earth cable.
3 WELDING GUIDELINES
3.1 CONTINUOUS MILD-STEEL WELDING
3.1.1 With gas protection
75% ARGON + 25% CO2 or 100% CO2 can be used for
mild steel welding.
Adjust the welding voltage with switch (57).
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Approach the point to be welded and press the torch
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push button (46).
Adjust the potentiometer (B fig.1) until the welding
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noise is constant and continuous.
If the speed is too high, the wire tends to get stuck on
the workpiece that makes the torch bounce back. If
speed is too low, the wire melts irregularly or else the
arc switches off.
NOTE: To obtain well joined and well shielded weldings
always weld from left to right and from up to down.
At the end of each welding remove the slags.
3.2 ALUMINIUM WELDING
The machine will be set up as for mild steel except for
the following changes:
1. 100% ARGON as welding protection gas.
2. Wire of composition suitable for the material to be
welded.
For ALUMAN welding wire 3-5% silicon.
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For ANTICORODAL welding wire 3-5% silicon.
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For PERALUMAN welding wire 5% magnesium.
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For ERGAL welding wire 5% magnesium.
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NOTE: If you only have a torch for steel wires, the same
shall be modified in the following way:
Make sure that length of torch cable does not
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exceed 118 inches (it is advisable not to use longer
torches).
Remove the brass liner-holding nut, the gas and the
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current nozzles, then slip the sheath off.
Insert the Teflon liner for aluminium and ensure it
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protrudes from both ends.
Screw the current nozzle so that the liner adheres to
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it.
Insert the liner-holding nipple, the O-Ring in the free
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end of the liner and secure with the nut without
tightening too much.
Slip the brass tube on the sheath and insert both into
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the adapter (after removing the iron tube that was fitted
inside the adapter).
Cut the liner diagonally so that it stays as close as
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possible to the wire drive roller.
Use drive rollers that are suitable for aluminium wire.
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The drive rollers, when being installed, must not be
tightened too much.
Use contact tips that are suitable for aluminium wire
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and make sure that the diameter of the contact tip hole
corresponds to the wire diameter that is going to be
used.
Use abrasive grinders and tool brushes specifically
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designed for aluminium. Never use these tools on other
materials.
REMEMBER that cleanliness equals quality. The wire
spools must be stored in plastic bags with a