Telwin LINEAR 220, Инструкция по эксплуатации

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of the symbols and numbers; the exact values of technical data for the
welding machine in your possession must be checked directly on the Warnings:
data plate of the welding machine itself. - Turn the welding cable connectors right down into the quick
connections (if present), to ensure a perfect electrical contact;
OTHER TECHNICAL DATA otherwise the connectors themselves will overheat, resulting in
their rapid deterioration and loss of efficiency.
- WELDING MACHINE: see table (TAB.1) - The welding cables should be as short as possible.
- ELECTRODE HOLDER CLAMP: see table (TAB. 2)
- 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.
4. DESCRIPTION OF THE WELDING MACHINE
Control, regulation and connection devices
6. WELDING: DESCRIPTION OF THE PROCEDURE
Fig. B
These welding machines are direct current power sources, suitable for
arc welding using electrodes with a range of coatings (rutile, acid,
basic).
5. INSTALLATION
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To switch on the welding machine turn the main switch (FIG. B (3)).
The output welding current intensity can be adjusted continuously,
using a manually operated magnetic shunt (FIG. B (1)).
WARNING! CARRY OUT ALL INSTALLATION OPERATIONS
The value of the current setting (I ) can be read on the graduated scale
2
AND ELECTRICAL CONNECTIONS WITH THE WELDING
in Amps (FIG. B (4)) on the front panel.
MACHINE COMPLETELY SWITCHED OFF AND DISCONNECTED
The current shown corresponds to the arc voltage (U ) according to
2
FROM THE POWER SUPPLY OUTLET.
the following relationship:
THE ELECTRICAL CONNECTIONS MUST BE MADE ONLY AND
U = (20 + 0,04 I ) V (EN 60974).
2 2
EXCLUSIVELY BY AUTHORISED OR QUALIFIED PERSONNEL.
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WELDING
PREPARATION
- Almost all stick electrodes are to be connected to the positive pole
Fig. C
(+) of the power source, only exceptionally to the negative pole (-)
Unpack the welding machine, assemble the separate parts contained
(acid covering).
in the package.
- It is most important that the user refers to the maker’s instructions
indicated on the stick electrode packaging. This will indicate the
Assembling the return cable-clamp
correct polarity of the stick electrode and the most suitable current.
Fig. D
- 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
Assembling the welding cable-electrode holder clamp
below the currents corresponding to various electrode diameters:
Fig. E
ø Electrode (mm) Welding current (A)
min. max.
HOW TO LIFT THE WELDING MACHINE
1.6 25 - 50
The welding machine MUST be lifted as shown in Fig. F .
2 40 - 80
For all other welding machines never use the handle for lifting.
2.5 60 - 110
This holds for the first time the welding machine is installed and
3.2 80 - 160
throughout its entire working life.
4 120 - 200
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6 200 - 350
WARNING! Position the welding machine on a flat surface
8 350 - 550
- The user must consider that, according to the electrode diameter,
with sufficient carrying capacity for its weight, to prevent it from
higher current values must be used for flat welding, whereas for
tipping or moving hazardously.
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vertical or overhead welds lower current values are necessary.
- In addition to being determined by the selected current intensity, the
CONNECTION TO THE MAIN POWER SUPPLY
mechanical characteristics of the welded join are determined by the
- Before making any electrical connection, make sure the rating data
other welding parameters i.e. arc length, working rate and position,
of the welding machine correspond to the mains voltage and
electrode diameter and quality (to store the electrodes correctly
frequency available at the place of installation.
keep them dry and protected by suitable packaging or containers).
- The welding machine should only be connected to a power supply
system with the neutral conductor connected to earth.
Welding procedure
- Holding the mask IN FRONT OF THE FACE, strike the electrode tip
PLUG AND OUTLET
on the workpiece as if you were striking a match. This is the correct
Connect a normalised plug (3P + T) having sufficient capacity- to the
strike-up method.
power cable and prepare a mains outlet fitted with fuses or an
WARNING : do not hit the electrode on the workpiece, this could
automatic circuit-breaker; the special earth terminal should be
damage the electrode and make strike-up difficult.
connected to the earth conductor (yellow-green) of the power supply
- As soon as arc is ignited, try to maintain a distance from the
line. Table (TAB.1) shows the recommended delayed fuse sizes in
workpiece equal to the diameter of the electrode in use. Keep this
amps, chosen according to the max. nominal current supplied by the
distance as much constant as possible for the duration of the weld.
welding machine, and the nominal voltage of the main power supply.
Remember that the angle of the electrode as it advances should be
of 20-30 grades
Set the locking screw on the knob of the voltage change switch to the
(Fig. H).
position corresponding to the actual available main power supply
- At the end of the weld bead, bring the end of the electrode
voltage.
backward, in order to fill the weld crater, quickly lift the electrode
FIG. G
from the weld pool to extinguish the arc.
The model with I ³ 450A has an internal voltage change switch, which
2
can be reached by removing the right panel (FIG. G1).
CHARACTERISTICS OF THE WELD BEAD
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Fig. I
WARNING! Failure to observe the above rules will make the
7. MAINTENANCE
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(Class 1) safety system installed by the manufacturer ineffective
with consequent serious risks to persons (e.g. electric shock)
WARNING! BEFORE CARRYING OUT MAINTENANCE and objects (e.g. fire).
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OPERATIONS MAKE SURE THE WELDING MACHINE IS
SWITCHED OFF AND DISCONNECTED FROM THE MAIN POWER
CONNECTION OF THE WELDING CABLES
SUPPLY.
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WARNING! BEFORE MAKING THE FOLLOWING
EXTRAORDINARY MAINTENANCE
CONNECTIONS MAKE SURE THE WELDING MACHINE IS EXTRAORDINARY MAINTENANCE OPERATIONS SHOULD BE
SWITCHED OFF AND DISCONNECTED FROM THE POWER
CARRIED OUT ONLY AND EXCLUSIVELY BY SKILLED OR
SUPPLY OUTLET. AUTHORISED ELECTRICAL-MECHANICAL TECHNICIANS.
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Table (TAB. 1) gives the recommended values for the welding cables
2
(in mm ) depending on the maximum current supplied by the welding
machine. WARNING! BEFORE REMOVING THE WELDING MACHINE
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PANELS AND WORKING INSIDE THE MACHINE MAKE SURE THE
WELDING MACHINE IS SWITCHED OFF AND DISCONNECTED
WELDING OPERATIONS WITH DIRECT CURRENT
FROM THE MAIN POWER SUPPLY OUTLET.
Connecting the electrode-holder clamp welding cable
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On the end take a special terminal that is used to close the uncovered
part of the electrode. If checks are made inside the welding machine while it is live, this
This cable is connected to the terminal with the symbol (+).
may cause serious electric shock due to direct contact with live
parts and/or injury due to direct contact with moving parts.
Connecting the welding current return cable - Inspect the welding machine regularly, with a frequency
This is connected to the piece being welded or to the metal bench depending on use and the dustiness of the environment, and
supporting it, as close as possible to the join being made. remove the dust deposited on the transformer, using a jet of dry
This cable is connected to the terminal with the symbol (-). compressed air (max. 10 bar).
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