Mig Welding - Helvi 1357 Manual De Uso Y Manutención

GB
tighten slightly (if there is too much pressu-
re the wire gets locked and the motor could
get damaged, if too loose the wire will not
be fed by the rolls). NOTE: The roll (M) has
two different grooves. The machine is set for
the diameter of the wire supplied with it. For
No-Gas welding the roll must be reversed in
order to have the correct groove for the flux-
cored wire diameter.
• Connect the power supply cable to the 230V
50Hz line and turn on the switch, then press
the torch switch. The wire fed by the wire
feeding motor at variable speed must slide
through the liner; when it exits from the torch
neck, release the torch switch, turn off the
machine and mount the contact tip and the
nozzle.
WARNING: The rolls, when in movement,
may crush the fingers. Periodically check
the rolls and replace them when they are
worn and compromise the regular fee-
ding of the wire.
ASSEMBLING OF THE TORCH
The Assembly of the torch is done only on models
with separate torch kit.
• Open the left side panel of the power source;
• Insert the torch in the appropriate seat, lock
it in the wire feeder motor (using the nut of
the kit) and make sure that the hole of the li-
ner is lined up with the channel between the
two rolls and the wire feeder. For better com-
prehension follow the drawings of FIGURE
4. Connect the gas hose to the receptacle on
the torch and fix it with a metal clamp. Joint
the two connectors of the torch switch, and
cover with the insulation cover (5).
18
Fig.4
1) Hand-wheel
2) Base for GAS-NO GAS selection
3) Power cable
4) Torch switch contacts (power source side)
5) Insulation cover
6) Torch switch contacts (Mig torch side)
7) Locking nut
8) Brass washer
9) Gas hose
10) Wire liner
11) Gas connector on the torch
12) Torch
The torch is the part of the equipment that needs
most maintenance. We recommend to check pe-
riodically the contact tips and the nozzle, these
parts must be clean and not worn-out. The torch
liner must be replaced when the wire does not run
smoothly.

MIG WELDING

In MIG welding (Metal Inert Gas) a continuously
fed metal electrode is melted into a welding pool
at constant and controlled speed.
The wire is connected to a constant voltage pole
while the workpiece is connected to the other pole.
When the wire is fed and touches the workpiece,
an electric arc is produced. The arc melts the wire
that is deposited on the workpiece.
GAS WELDING
In order to weld Stainless steel or Aluminium the
power source must be set for gas welding *.
This operation is very simple, you only need the
following spare parts and items (please contact your
welding supplier):
• Wire – All these power sources work with
5Kg-wire spools (wire diameter 0.6mm or
0.8mm).
• Tip – The tip is correct when it matches with
the wire diameter. (Note: when using alumi-
nium wire of diameter 0.8mm the tip must
be 1.0mm)
• Gas – You can buy disposable gas cylinders
from the local distributor or from a reseller
of spare parts, while rechargeable gas cylin-
ders can be supplied by the local re-seller of
spare parts.
• Gas regulators - You can buy the regulator
suited for the gas cylinder from the local di-
stributor or from a re-seller of spare parts
for welding equipment. Note: As first thing
you should decide if you want to use rechar-
geable or disposable gas cylinders because
this will affect the choice of the regulator.
• Adapters – For the use of rechargeable gas
cylinders you need and adapter for big gas
cylinders (FIG.6).
PREPARATION FOR WELDING
• Connect the welding machine to the 230V
50/60Hz line;