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Telwin PRATICA 151 Seite 4

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with sufficient carrying capacity for its weight, to prevent it CHARACTERISTICS OF THE WELD BEAD
from tipping or moving hazardously. Fig. E
CONNECTION TO THE MAIN POWER SUPPLY
7. MAINTENANCE
- Before making any electrical connection, make sure the rating data
WARNING! BEFORE CARRYING OUT MAINTENANCE
of the welding machine correspond to the mains voltage and
frequency available at the place of installation.
OPERATIONS MAKE SURE THE WELDING MACHINE IS
- The welding machine should only be connected to a power supply
SWITCHED OFF AND DISCONNECTED FROM THE MAIN POWER
system with the neutral conductor connected to earth.
SUPPLY.
- To comply with the requirements of the EN 61000-3-11 (Flicker)
standard we recommend connecting the welding machine to
EXTRAORDINARY MAINTENANCE:
interface points of the power supply that have an impedance of less
EXTRAORDINARY MAINTENANCE OPERATIONS SHOULD BE
than Zmax =0,3 ohm.
CARRIED OUT ONLY AND EXCLUSIVELY BY SKILLED OR
AUTHORISED ELECTRICAL-MECHANICAL TECHNICIANS.
CONNECTION OF THE WELDING CABLES
WARNING! BEFORE REMOVING THE WELDING MACHINE
WARNING! BEFORE MAKING THE FOLLOWING
PANELS AND WORKING INSIDE THE MACHINE MAKE SURE THE
CONNECTIONS MAKE SURE THE WELDING MACHINE IS
WELDING MACHINE IS SWITCHED OFF AND DISCONNECTED
SWITCHED OFF AND DISCONNECTED FROM THE POWER
FROM THE MAIN POWER SUPPLY OUTLET.
SUPPLY OUTLET.
If checks are made inside the welding machine while it is live, this
Table 1 (TAB. 1) gives the recommended values for the welding cables
may cause serious electric shock due to direct contact with live
2
(in mm ) depending on the maximum current supplied by the welding
parts and/or injury due to direct contact with moving parts.
machine.
- Inspect the welding machine regularly, with a frequency depending
on use and the dustiness of the environment, and remove the dust
Connecting the electrode-holder clamp welding cable
deposited on the transformer, using a jet of dry compressed air
On the end take a special terminal that is used to close the uncovered
(max. 10 bar).
part of the electrode.
- At the same time make sure the electrical connections are tight and
For welding machines supplied with a terminal, this cable is connected
check the wiring for damage to the insulation.
- At the end of these operations re-assemble the panels of the
to the terminal with the symbol .
welding machine and screw the fastening screws right down.
- Never, ever carry out welding operations while the welding
Connecting the welding current return cable
machine is open.
This is connected to the piece being welded or to the metal bench
- If necessary use a very thin layer of grease, at a high temperature,
supporting it, as close as possible to the join being made. For welding
to lubricate the moving parts of the regulators (threaded shaft,
machines supplied with a terminal, the cable is connected to the
sliding surfaces, shunts etc.).
terminal with the symbol .
- Replacing the power supply cable: before replacing the cable,
identify the screw-connecting terminals L1 and L2 (N) on the
6. WELDING: DESCRIPTION OF THE PROCEDURE
switches (Fig. F).
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
_______________(I)_______________
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
MANUALE ISTRUZIONE
continuously, by means of a manually operated magnetic shunt (Fig.
B-2).
The value of the current setting, (I ) can be read in Amps on the
2
graduated scale (Fig. B-4) on the top or side panel of machines where
it is provided.
ATTENZIONE:
PRIMA DI UTILIZZARE LA SALDATRICE LEGGERE
THERMOSTATIC PROTECTION
ATTENTAMENTE IL MANUALE DI ISTRUZIONE!
This welder is automatically protected from thermic overheating
(thermostat automatic re-start). When the windings reach
SALDATRICI MANUALI AD ARCO PER ELETTRODO RIVESTITO
performance temperature, the protections cut off the supply circuit,
(MMA) A SERVIZIO LIMITATO.
igniting the yellow lamp on the front panel (B-5). After a few minutes’
Nota: Nel testo che segue verrà impiegato il termine “saldatrice”.
cooling the protection will reopen the supply line and turn off the yellow
lamp. The welder is ready for further use.
1. SICUREZZA GENERALE PER LA SALDATURA AD ARCO
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
- Evitare i contatti diretti con il circuito di saldatura; la tensione a
below the currents corresponding to various electrode diameters:
vuoto fornita dal generatore può essere pericolosa in talune
circostanze.
ø Electrode (mm) Welding current (A)
- La connessione dei cavi di saldatura, le operazioni di verifica e
min. max.
di riparazione devono essere eseguite a saldatrice spenta e
1.6 25 - 50
scollegata dalla rete di alimentazione.
2 40 - 80
- Spegnere la saldatrice e scollegarla dalla rete di alimentazione
2.5 60 - 110
prima di sostituire i particolari d'usura della torcia.
3.2 80 - 160
- Eseguire l'installazione elettrica secondo le previste norme e
leggi antinfortunistiche.
- The user must consider that, according to the electrode diameter,
- La saldatrice deve essere collegata esclusivamente ad un
higher current values must be used for flat welding, whereas for
sistema di alimentazione con conduttore di neutro collegato a
vertical or overhead welds lower current values are necessary.
terra.
- In addition to being determined by the selected current intensity, the
- Assicurarsi che la presa di alimentazione sia correttamente
mechanical characteristics of the welded join are determined by the
collegata alla terra di protezione.
other welding parameters i.e. arc length, working rate and position,
- Non utilizzare la saldatrice in ambienti umidi o bagnati o sotto
electrode diameter and quality (to store the electrodes correctly
la pioggia.
keep them dry and protected by suitable packaging or containers).
- Non utilizzare cavi con isolamento deteriorato o con
connessioni allentate.
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.
- Non saldare su contenitori, recipienti o tubazioni che
WARNING: do not hit the electrode on the workpiece, this could
damage the electrode and make strike-up difficult.
contengano o che abbiano contenuto prodotti infiammabili
- As soon as arc is ignited, try to maintain a distance from the
liquidi o gassosi.
workpiece equal to the diameter of the electrode in use. Keep this
- Evitare di operare su materiali puliti con solventi clorurati o
distance as much constant as possible for the duration of the weld.
nelle vicinanze di dette sostanze.
Remember that the angle of the electrode as it advances should be
- Non saldare su recipienti in pressione.
of 20-30 grades (Fig. D).
- Allontanare dall'area di lavoro tutte le sostanze infiammabili
- At the end of the weld bead, bring the end of the electrode backward,
(p.es. legno, carta, stracci, etc.)
in order to fill the weld crater, quickly lift the electrode from the weld
- Assicurarsi un ricambio d'aria adeguato o di mezzi atti ad
pool to extinguish the arc.
asportare i fumi di saldatura nelle vicinanze dell'arco; è
necessario un approccio sistematico per la valutazione dei
limiti all'esposizione dei fumi di saldatura in funzione della
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