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EN
stuck in the bath or protrudes too far from the torch contact tube;
otherwise, if the control time is too long, the wire remains stuck in
the torch contact tube, often causing damage to the latter.
8 - Euro torch connector
9 - Quick connectors for ground clamp
10 - Power switch.
11 - Welding voltage adjustment switch.
INTERNAL PANEL CONTROLS
- Auxiliary circuit safety fuses
- Wire feed gearmotor
4.0
USE WITH CORED WIRE.
Equipment allows polarity changeover for welding with special
cored wire types. Polarity is indicated by wire specification.
Polarity DC-
Picture 2.
Polarity DC+
Picture 3.
5.0
BASIC INFORMATION REGARDING MIG
WELDING
MIG WELDING PRINCIPLES
MIG welding is autogenous, i.e. it permits welding of pieces made of
the same metal (mild steel, stainless steel, aluminium) by fusion,
while granting both physical and mechanical continuity. The heat re-
quired for melting is generated by an electric arc that strikes between
the wire (electrode) and the piece to be welded. A shield gas protects
both the arc and the molten metal from the atmosphere.
6.0
CONNECTION AND PREPARATION OF
EQUIPMENT FOR WELDING
Connect welding accessories carefully to avoid power loss
or leakage of dangerous gases.
Carefully follow the safety standards
N.B. DO NOT ADJUST SWITCHES DURING WELDING OPER-
ATIONS TO AVOID DAMAGE TO THE EQUIPMENT.
CHECK THAT GAS IS DELIVERED FROM THE NOZZLE AND AD-
JUST FLOW BY MEANS OF THE PRESSURE REDUCER VALVE.
CAUTION: SCREEN GAS FLOW WHEN OPERATING IN OUT-
DOOR OR VENTILATED SITES; WELDING OPERATIONS
MAY NOT BE PROTECTED DUE TO DISPERSION OF INERT
SHIELDING GASES.
6.1
WELDING
1.
Open the gas cylinder and regulate gas outlet flow as re-
quired. Fit the earth clamp on a part of the welding piece with-
out any paint, plastic or rust.
USE WITH CORED WIRE.
2.
Select the welding current by means of switches (Ref. 11 - Picture
1 Page 4.); bear in mind that the greater the welding thickness, the
more power is required. The first switch setting is suitable for mini-
mum thickness welding.Also take into account that each setting fea-
tures a specific wire drive speed which can be selected by means of
adjustment knob (Ref. 4 - Picture 1 Page 4.).
6.2
For MIG welding, proceed as follows:
1.
Use a binary shielding gas (commonly a AR/CO2 mixture
with percentages ranging from 75-80% of Argon and from 20-
25% of CO2), or ternary mixtures such as AR/CO2/O2.
These gases provide welding heat and a uniform and com-
pact bead, although penetration is low. Use of carbon dioxide
(MAG) as a shielding gas achieves a thin and well-penetrat-
ed bead but ionisation of the gas may impair arc stability.
2.
Use a wire feed of the same quality of that of the steel for
welding. Always use good quality wire; welding with rusty
wires can cause welding defects.
In general the applicable current range for wire use is:
- Ø wire mm x 100 = minimum Amps.
- Ø wire mm x 200 = minimum Amps.
Example: Ø filo 1.2 mm= minimum Amps 120 mm/maximum
Amps 240. The above range is used with binary AR/CO2 gas
mixtures and with short-circuiting transfer (SHORT).
3.
Do not weld parts where rust, oil or grease is present.
4.
Use a torch suited to welding current specifications.
5.
Periodically check that the earth clamp pads are not dam-
aged and that the welding cables (torch and earth) are not cut
or burnt which could impair efficiency.
6.3
MIG Welding of 300 series (austenitic) stainless steel must be car-
ried out with a shielding gas that has a high Argon content and a
small percentage of O2 to stabilise the arc. The most commonly
used mixture is AR/O2 98/2.
- Never use CO2 or AR/CO2 mixtures.
- Never touch the wire.
The filler material used must be of a higher quality than the base
material and the welding zone must be completely clean.
6.4
To MIG weld aluminium, use the following:
1.
100% Argon shielding gas.
2.
Filler wire with a composition suited to the base welding ma-
terial. To weld ALUMAN and ANTICORODAL use 3-5% sili-
con wire.To weld PERALUMAN and ERGAL use 5%
magnesium wire.
3.
Use a torch designed for aluminium welding.
6.5
This type of welding is used for spot welding two overlapping
sheets, and requires the use of a special gas nozzle.
Fit the spot welding gas nozzle, press it against the piece to be
welded. Press the torch button; note that the welder will eventually
detach from the piece. This time period is fixed by the TIMER con-
trol (Ref. 5 - Picture 1 Page 4.), and must be set depending on the
thickness of the material.
5 EN
For optimal welding, keep the
torch in the same direction as the
wire feed, as illustrated in figure.
CARBON STEEL WELDING
STAINLESS STEEL WELDING
ALUMINIUM WELDING
SPOT WELDING
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