ELLETRO TURBO 215 Manuel D'instructions page 8

2.2 PROTECTION SYSTEM
The unit is equipped with an internal protection which assures a
lasting proper operation.
A thermostat situated on the secondary winding of the
transformer opens the supply circuit in case of overheating,
assuring the protection of the transformer. In this case, it is
necessary to await some minutes to have the reset of the
thermostat.
OVER VOLTAGE CAN DAMAGE THE UNIT.
2.3 UNIT DESCRIPTION (Picture 3)
1) Electrode holder welding cable connection.
2) Earth welding cable connection.
3) Current regulating hand - wheel.
4) Input supply cable.
5) Switch.
6) Thermostat light.
7) Pilot light.
2.4 GENERAL NOTES
Before using this welding machine, carefully read the standards
HD 407 and HD 433 and also check insulation of cables,
electrode holder clamp, sockets and plugs and that the section
and length of welding cables are compatible with current used.
2.5 COATED ELECTRODE WELDING
- Use the electrode holder clamps in compliance with the safety
standards and without projecting tightening screws.
- Make sure that switch is in 0 position or that the plug is not
inserted in supply socket then connect welding cables in
accordance with polarity demanded by the manufacturer of
the electrodes which you will be using.
- Welding circuit should not be deliberately placed in direct or
indirect contact with protection wire if not in the piece to be
weld.
- If earthing is deliberately made on the workpiece by means of
protection wire, the connection must be as direct as possible,
with the wire having a section at least equal to the welding
return current wire and connected to the piece being worked
on in the same place as the return wire, using the return wire
terminal or a second earth terminal close by.
- All possible precautions must be taken in order to avoid stray
currents.
- When taking voltage from a three-phase line, be very
careful when connecting the supply cable earth wire to
the socket earth pole.
- Connect the supply cable. When mounting a plug, make sure
that its capacity is adequate and that the yellow-green wire of
the mains cable is connected to the earth plug pin.
- The capacity of magneto-thermic switch or of fuses in series
with mains supply should be more than or equal to current I
absorbed by the unit.
- The absorbed current I
technical specifications on unit corresponding to the available
power supply voltage U
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- The sections of all extensions should be adequate to
absorbed current I .
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- Turn machine on by means of the switch pos. 5 picture 3.
WARNING: ELECTRIC SHOCK CAN KILL.
- Do not touch live electric parts.
- Do not touch weld output terminals when unit is energized.
- Do not touch electrode holder and earth clamp at the same
is determined by reading the
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time.
- Adjust the current according to the diameter of the electrode,
to the welding position and to the type of joint to be carried
out. When you have finished to weld, always remember to
turn the unit off, and to remove the electrode from the
electrode holder.
2.6 ADVICE ABOUT WELDING
A good preparation of the wedges to be welded is fundamental
to get the best welding; it is also necessary to remove all
impurities (grease, paint, rust) from the edges.
In order to prevent the strains of the piece owing to shrinkage,
in particular with thin thicknesses, before starting the real
welding we recommend to tack the pieces on several spots at a
distance of 200 mm approx. from one another.
In the butt welding, for thicknesses up to 3 mm, keep the pieces
in contact; from 3 to 5 mm keep a gap of 1 to 2 mm (picture 4).
For thicknesses from 5 to 15 mm the V set-up is required
(picture 5); over 15 mm make use of X set-up (pict. 6).
Adjust the welding current according to the diameter of the
electrode and the thickness of the piece to be welded. Carry out
this adjustment by rotating the handwheel located on the front of
the welding machine: rotate counter-clockwise to decrease and
clockwise to increase.
Spark starting: put the point of the electrode at 2 mm approx.,
from the spot to weld, with an angle of about 45° as to the
welding plane; put the faceplate on and, by rubbing, put the
point of the electrode in contact with the piece to be welded;
always keep the same inclination. As soon as the spark starts,
move the electrode away by 1 or 2 mm; the lighting power of the
spark will allow you to see through the dark glass of the face -
plate. Make sure that the spark be exactly on the edges to be
welded; now keep the spark on in order to heat the piece to be
welded and make the electrode melt.
To get this, move the hand back regularly, evenly and slowly by
1 or 2 mm, as the electrode, when melting, makes the distance
from the piece to be welded increase (see picture 7).
In order to get perfect weld beads make sure of the following:
a) the lag floating on the weld pool should never exceed the
electrode, otherwise the welding would be porous (i.e. the
evenness of the weld bead would be broken by any voids);
b) the advancing speed is to be proportional to the diameter of
the electrode and the surface to cover;
c) the width of the weld bead should be got by little and even
oscillating movements;
d) the welding current is to be neither poor nor excessive. In the
first case a weld bead would be obtained which shows a
marked roundness upwards and a poor penetration; in the
second case the penetration would be very deep and the bead
would show a flat roundness.
The obstacles the beginner comes up against in the welding are
mainly the electrode sticking and piercing.
Sticking occurs when the welding current is poor or when the
electrode is brought too strongly in touch with the piece. If the
electrode sticks to the piece, do not try to tear it out, but make
an oscillating motion and at the same time pull back.
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Piercing or burning generally occurs on thin thicknesses and is
due to the overheating of the piece; in this case we recommend
to carry out the welding at intervals.
3 MAINTENANCE AND CHECK UP
3.1 GENERAL NOTES
WARNING: ELECTRIC SHOCK CAN KILL.
- Do not touch live electrical parts.
- Turn off welding power source and remove input
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