General Notes; Welding Mild Steel; Welding Aluminium; Welding Stainless Steel - Elettro MIG 140 Manuel D'instructions

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 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 connecting the power cable, make sure that the
power voltage corresponds to that of the welding machine
and that the earth plug is efficient.
Connect the earth clamp C 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 G.
Remove the tapered gas tip 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 the body, other people or
metals 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 tip on, always turning
clockwise.
WARNING! ELECTRIC SHOCK CAN KILL.
Do not touch live electrical parts.
•
Do not touch the weld output terminals when the unit is
•
energised.
Do not touch the torch or electrode holder and the 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.
4.1 CONNECTING THE GAS HOSE
• The gas cylinder must be equipped with a pressure
reducer and flow meter.
• Connect the gas hose leaving 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.
Connect the cables as shown in the pict. 2.
Select the welding current by means of the switches D and
E.
Move the torch near the welding point and press the
trigger.
Adjust the potentiometer knob F 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.
5.1.2 Without gas protection.
Connect the cables as shown in the pict. 3.
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 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.
8
98% ARGON + 2% 02