Telwin 953100 Bedienungsanleitung Seite 4

Assembling the welding cable-electrode holder clamp
WARNING! Position the welding machine on a flat surface
with sufficient carrying capacity for its weight, to prevent it
from tipping or moving hazardously.
CONNECTION TO THE MAIN POWER SUPPLY
- Before making any electrical connection, make sure the rating data
of the welding machine correspond to the 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.
PLUG AND OUTLET. (For welding machines without a plug) :
connect a normalised plug (2P + T, 3P + 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 1 (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 welders with double voltage supply, it is necessary to set the
blocking screw of the voltage-reverse switch in the position corre
sponding to the voltage really available (see example below).
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).
CONNECTION OF THE WELDING CABLES
W A R N I N G ! B E F O R E M A K I N G T H E F O L L O W I N G
CONNECTIONS MAKE SURE THE WELDING MACHINE IS
SWITCHED OFF AND DISCONNECTED FROM THE POWER
SUPPLY OUTLET .
Table 1 (TAB. 1) gives the recommended values for the welding cables
2
(in mm ) depending on the maximum current supplied by the welding
machine.
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.
For welding machines supplied with a terminal, 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. For welding
machines supplied with a terminal, the cable is connected to the
terminal with the symbol
6. WELDING: DESCRIPTION OF THE PROCEDURE
These welding machines consist of a drooping specification, single
phase transformer and are suitable for welding with alternating current
using coated electrodes (E 43 R type) based on the diameters given
on the data plate .
To switch on the welding machine operate the main switch (Fig. B-1).
The intensity of the supplied welding current can be adjusted
continuously, by means of a manually operated magnetic shunt (Fig.
B-2), or step-by-step by means of a manually operated switch (Fig. B-
3).
CHECK THE WELDING MACHINE MODEL.
N.B. In the case of a welding machine with switch, current adjustment
should be carried out with the main switch (Fig. B-1) in the O position
(off).
The value of the current setting, (I ) can be read in Amps on the
graduated scale (Fig. B-4) on the top or side panel of machines where
it is provided.
The corresponding arc voltage (U ) for the current shown is given
according to the following relationship:
U = (18 + 0,04 I ) V (EN 50060).
2 2
THERMOSTATIC PROTECTION
This welder is automatically protected from thermic overheating
(thermostat automatic re-start). When the windings reach
performance temperature, the protections cut off the supply circuit,
igniting the yellow lamp on the front panel (B-5). After a few minutes'
cooling the protection will reopen the supply line and turn off the yellow
lamp. The welder is ready f o r further use.
WELDING
- Use electrodes suitable for working in alternating 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:
Fig. F
Fig. G
.
.
2
2
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.
- In addition to being determined by the selected current intensity, the
mechanical characteristics of the welded join are 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 dry and protected by suitable packaging or containers).
Welding 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.H).
- 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
WARNING! BEFORE CARRYING OUT MAINTENANCE
OPERATIONS MAKE SURE THE WELDING MACHINE IS
SWITCHED OFF AND DISCONNECTED FROM THE MAIN POWER
SUPPLY .
EXTRAORDINARY MAINTENANCE:
EXTRAORDINARY MAINTENANCE OPERATIONS SHOULD BE
CARRIED OUT ONLY AND EXCLUSIVEL Y BY SKILLED OR
AUTHORISED ELECTRICAL-MECHANICAL TECHNICIANS.
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 .
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, using a jet of dry compressed air
(max. 10 bar).
- At the same time make sure the electrical connections are tight and
check the wiring for damage to the insulation.
- At the end of these operations re-assemble the panels of the
welding machine and screw the fastening screws right down.
- Never, ever carry out welding operations while the welding
machine is open.
- If necessary use a very thin layer of grease, at a high temperature,
to lubricate the moving parts of the regulators (threaded shaft,
sliding surfaces, shunts etc.).
- Replacing the power supply cable: before replacing the cable,
identify the screw-connecting terminals L1 and L2 (N) on the
switches (Fig.L).
_______________(I)______________
MANUALE ISTRUZIONE
ATTENZIONE:
PRIMA DI UTILIZZARE LA SALDATRICE LEGGERE
ATTENTAMENTE IL MANUALE DI ISTRUZIONE!
SALDATRICI MANUALI AD ARCO PER ELETTRODO RIVESTITO
(MMA) A SERVIZIO LIMITA TO.
Nota: Nel testo che segue verrà impiegato il termine "saldatrice" .
1. SICUREZZA GENERALE PER LA SALDATURA AD ARCO
- Evitare i contatti diretti con il circuito di saldatura; la tensione a
vuoto fornita dal generatore può essere pericolosa in talune
circostanze.
- 4 -
Welding current (A)
min. max.
25 - 50
40 - 80
60 - 110
80 - 160
120 - 200
Fig. I