Telwin TECNICA 114 Manual De Instrucciones página 13

mains voltage and frequency available at the place of
installation.
- The welding machine should only be connected to a
power supply system with the neutral conductor
connected to earth.
- To comply with the requirements of the EN 61000-3-11
(Flicker) standard we recommend connecting the
welding machine to interface points of the power supply
that have an impedance of less than Zmax =0,24 ohm.
- We advise against powering the welding machine by
means of generator sets. The welding machine model
carrying the "GE" (Generator Set) mark can be powered
by a generator set with a power of at least 1,5 times the
maximum power of the welding machine.
- PLUG AND OUTLET:
- The 230V model is fitted at the factory with a power
supply cable and normalised plug, (2P + T) 16A/250V .
It can therefore be connected to a mains outlet fitted
with fuses or an automatic circuit-breaker; the special
earth terminal should be connected to the earth
conductor (yellow-green) of the power supply line.
Table (TAB.1) shows the recommended delayed fuse
sizes in amps, chosen according to the max. nominal
current supplied by the welding machine, and the
nominal voltage of the main power supply.
- For welding machines without a plug (115/230V
models), connect a normalised plug (2P + T) - having
sufficient capacity- to the power cable and prepare a
mains outlet fitted with fuses or an automatic circuit-
breaker; the special earth terminal should be
connected to the earth conductor (yellow-green) of the
power supply line. Table (TAB.1) shows the
recommended delayed fuse sizes in amps, chosen
according to the max. nominal current supplied by the
welding machine, and the nominal voltage of the main
power supply.
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WARNING! Failure to observe the above rules will
make the (Class 1) safety system installed by the
manufacturer ineffective with consequent serious risks
to persons (e.g. electric shock) and objects (e.g. fire).
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CONNECTION OF THE WELDING CABLES
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WARNING! BEFORE MAKING THE FOLLOWING
CONNECTIONS MAKE SURE THE WELDING MACHINE
IS SWITCHED OFF AND DISCONNECTED FROM THE
POWER SUPPLY OUTLET.
Table (TAB. 1) gives the recommended values for the
2
welding cables (in mm ) depending on the maximum current
supplied by the welding machine.
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MMA WELDING
Almost all coated electrodes are connected to the positive
pole (+) of the power source; as an exception to the negative
pole (-) for acid coated electrodes.
WELDING OPERATIONS WITH DIRECT CURRENT
Connecting the electrode-holder clamp welding cable
On the end take a special terminal that is used to close the
uncovered part of the electrode.
This cable is connected to the terminal with the symbol (+)
Connecting the welding current return cable
This is connected to the piece being welded or to the metal
bench supporting it, as close as possible to the join being
made.
This cable is connected to the terminal with the symbol (-)
Warnings:
- Turn the welding cable connectors right down into the
quick connections (if present), to ensure a perfect
electrical contact; otherwise the connectors themselves
will overheat, resulting in their rapid deterioration and loss
of efficiency.
- The welding cables should be as short as possible.
- Do not use metal structures which are not part of the
workpiece to substitute the return cable of the welding
current: this could jeopardise safety and result in poor
welding.
6. WELDING: DESCRIPTION OF THE
PROCEDURE
- It is most important that the user refers to the maker's
instructions indicated on the stick electrode packaging.
This will indicate the correct polarity of the stick
electrode and the most suitable current.
- The welding current must be regulated according to the
diameter of the electrode in use and the type of the joint
to be carried out: see below the currents corresponding
to various electrode diameters:
ø Electrode (mm)
1,6
2
2,5
3,2
4
- The user must consider that, according to the electrode
diameter, higher current values must be used for flat
welding, whereas for vertical or overhead welds lower
current values are necessary.
- As well as being determined by the chosen current
intensity, the mechanical characteristics of the welded
join are also determined by the other welding parameters
i.e. arc length, working rate and position, electrode
diameter and quality (to store the electrodes correctly,
keep them in a dry place protected by their packaging or
containers).
- It is possible that welding with particular rutile electrodes
creates excessive spray: in this case we recommend
turning the selector on the front of the welding machine to
the TIG position.
Procedure
- Holding the mask IN FRONT OF THE FACE, strike the
electrode tip on the workpiece as if you were striking a
match. This is the correct strike-up method.
WARNING: do not hit the electrode on the workpiece, this
could damage the electrode and make strike-up difficult.
- As soon as arc is ignited, try to maintain a distance from
the workpiece equal to the diameter of the electrode in
use. Keep this distance as much constant as possible for
the duration of the weld. Remember that the angle of the
electrode as it advances should be of 20-30 grades (Fig.
G).
- At the end of the weld bead, bring the end of the electrode
backward, in order to fill the weld crater, quickly lift the
electrode from the weld pool to extinguish the arc.
CHARACTERISTICS OF THE WELD BEAD
7. MAINTENANCE
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W A R N I N G ! B E F O R E C A R RY I N G O U T
MAINTENANCE OPERATIONS MAKE SURE THE
WELDING MACHINE IS SWITCHED OFF AND
DISCONNECTED FROM THE MAIN POWER SUPPLY .
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EXTRAORDINARY MAINTENANCE
EXTRAORDINARY MAINTENANCE OPERATIONS
SHOULD BE CARRIED OUT ONLY AND EXCLUSIVEL Y
BY SKILLED OR AUTHORISED ELECTRICAL-
MECHANICAL TECHNICIANS.
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WARNING! BEFORE REMOVING THE WELDING
MACHINE PANELS AND WORKING INSIDE THE
MACHINE MAKE SURE THE WELDING MACHINE IS
SWITCHED OFF AND DISCONNECTED FROM THE
MAIN POWER SUPPLY OUTLET.
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If checks are made inside the welding machine while it
is live, this may cause serious electric shock due to
direct contact with live parts and/or injury due to direct
contact with moving parts.
- Inspect the welding machine regularly, with a frequency
depending on use and the dustiness of the environment,
and remove the dust deposited on the transformer,
- 13 -
Welding current (A)
min. max.
25 - 50
40 - 80
60 - 110
80 - 160
120 - 200
Fig. H