Installation - Elettro CF MIG 237 Instruction Manual

4 INSTALLATION

The machine must be installed by skilled personnel. All
connections must be made in compliance with current
regulations and in full respect of safety laws (see standards
CEI 26-10 and CENELEC HD 427).
Make sure that the welding wire diameter corresponds to
the one indicated on the roller, and mount the wire reel.
Make sure that the welding wire passes through the groove
in the small roller.
Before plugging in the power cord, make sure that the
mains supply voltage corresponds to that of the welding
machine, then:
a) for permanent connection to the mains without a plug,
you must have a main switch having a suitable
capacity in compliance with the rated specifications.
b) for a plug-socket connection, use a plug having a
suitable capacity in compliance with the rated
specifications.
In this case the plug must be used to completely unplug the
machine from the mains, after having switched it off turning
the switch C to "O" (off) position.
The yellow-green wire must be connected to the earth
terminal.
Connect the earth clamp E to the part to be welded.
The welding circuit must not be deliberately placed in direct
or indirect contact with the protection wire except in the
workpiece.
If the workpiece is deliberately grounded using the
protection wire, the connection must be as direct as
possible, using a wire at least as large as the welding
current return wire, and connected to the workpiece at the
same point as the return wire, using the return wire clamp
or a second grounding clamp placed next to it.
All precautions must be taken to avoid stray welding
currents.
Turn the machine on using the switch C.
Remove the tapered gas nozzle by turning it clockwise.
Unscrew the contact tip.
Do not press the torch trigger until you have read the
instructions carefully.
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 and release it only when the welding
wire comes out.
Welding wire can cause puncture wounds.
Never aim the torch at parts of your body, at other people
or at metal parts when loading the welding wire.
Screw the contact tip back on, making sure that the hole
diameter corresponds to the wire used.
Slide the tapered gas welding nozzle on, always turning
clockwise.
4.1 CONNECTING THE GAS HOSE
• The gas cylinder must be equipped with a pressure
reducer and flow meter.
• If the cylinder is placed on the cylinder holder of the
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 coming out from the back of the
machine to the pressure reducer only after the cylinder is in
place.
• Open the gas cylinder and set the flow meter to
approximately 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
regulations 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% CO2 or 100% CO2 may be
used for welding mild steel.
Select the welding current by means of the rotary switch C.
Move the torch near the welding point and press the
trigger.
Adjust the potentiometer knob G 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 4.
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
dehumidifying packets.
For the correct welding angle see figure 4.
5.3 WELDING STAINLESS STEEL
The welding machine must be prepared as for welding mild
steel with gas protection, but with the following differences:
— Reel of stainless steel wire compatible with the
composition of the material to be welded.
— Cylinder containing
(recommended composition)
The recommended torch angle and welding direction are
shown in figure 4.
7
98% ARGON + 2% 02