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Telwin FORCE 168 Seite 8

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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 difcult.
- 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 ll the weld crater, quickly lift the electrode
from the weld pool to extinguish the arc.
CHARACTERISTICSOFTHEWELDBEAD
Fig. H
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 MUST ONLY BE CARRIED
OUT BY TECHNICIANS WHO ARE EXPERT OR QUALIFIED IN
THE ELECTRIC-MECHANICAL FIELD, AND IN FULL RESPECT
OF THE IEC/EN 60974-4 TECHNICAL DIRECTIVE.
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, reactance and rectier using a jet of
dry compressed air (max. 10bar).
- Do not direct the jet of compressed air on the electronic boards;
these can be cleaned with a very soft brush or suitable solvents.
- 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.
- After having carried out maintenance or repairs, restore the
connections and wiring as they were before, making sure they do
not come into contact with moving parts or parts that can reach high
temperatures. Tie all the wires as they were before, being careful
to keep the high voltage connections of the primary transformer
separate from the low voltage ones of the secondary transformer.
Use all the original washers and screws when closing the casing.
8. TROUBLESHOOTING
IN CASE OF UNSATISFACTORY FUNCTIONING, BEFORE
SERVICING MACHINE OR REQUESTING ASSISTANCE, CARRY
OUT THE FOLLOWING CHECK:
- Check that the welding current, which is regulated by the
potentiometer with a graduated amp scale, is correct for the
diamter and electrode type in use.
- Check that when general switch is ON the relative lamp is ON.
If this is not the case then the problem is located on the mains
(cables, plugs, outlets, fuses, etc.)
- Check that the yellow led (ie. thermal protection interruption- either
over or undervoltage or short circuit) is not lit.
- Check that the nominal intermittance ratio is correct. In case there
is a thermal protection interruption, wait for the machine to cool
down, check that the fan is working properly.
- Check the mains voltage: if the value is too high or too low the
welding machine will be stopped.
- Check that there is no short-circuit at the output of the machine: if
this is the case eliminate the incovenience.
- Check that all connections of the welding circuit are correct,
particularly that the work clamp is well attached to the workpiece,
with no interferring material or surface-coverings (ie. Paint).
- Protective gas must be of appropriate type (Argon 99.5%) and
quantity.
I
MANUALE ISTRUZIONE
ATTENZIONE! PRIMA DI UTILIZZARE LA SALDATRICE
LEGGERE ATTENTAMENTE IL MANUALE DI ISTRUZIONE.
1. SICUREZZA GENERALE PER LA SALDATURA AD ARCO
L’operatoredeveesseresufcientementeedottosull’usosicuro
della saldatrice ed informato sui rischi connessi ai procedimenti
per saldatura ad arco, alle relative misure di protezione ed alle
procedure di emergenza.
(Fare riferimento anche alla norma “EN 60974-9: Apparecchiature
per saldatura ad arco. Parte 9: Installazione ed uso”).
- Evitare i contatti diretti con il circuito di saldatura; la tensione
a vuoto fornita della saldatrice può essere pericolosa in talune
circostanze.
- Laconnessionedeicavidisaldatura,leoperazionidiverica
e di riparazione devono essere eseguite a saldatrice spenta e
scollegata dalla rete di alimentazione.
- Spegnere la saldatrice e scollegarla dalla rete di alimentazione
prima di sostituire i particolari d’usura della torcia.
- Eseguire l’installazione elettrica secondo le previste norme e
leggi antinfortunistiche.
- La saldatrice deve essere collegata esclusivamente ad un
sistema di alimentazione con conduttore di neutro collegato
a terra.
- Assicurarsi che la presa di alimentazione sia correttamente
collegata alla terra di protezione.
- Non utilizzare la saldatrice in ambienti umidi o bagnati o sotto
la pioggia.
- Non utilizzare cavi con isolamento deteriorato o con
connessioni allentate.
- Non saldare su contenitori, recipienti o tubazioni che
contengano o che abbiano contenuto prodotti inammabili
liquidi o gassosi.
- Evitare di operare su materiali puliti con solventi clorurati o
nelle vicinanze di dette sostanze.
- Non saldare su recipienti in pressione.
- Allontanaredall’areadilavoro tuttelesostanze inammabili
(es. legno, carta, stracci, etc.).
- Assicurarsi un ricambio d’aria adeguato o di mezzi atti ad
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
loro composizione, concentrazione e durata dell’esposizione
stessa.
- Mantenere la bombola al riparo da fonti di calore, compreso
l’irraggiamento solare (se utilizzata).
- Adottare un adeguato isolamento elettrico rispetto l’elettrodo,
il pezzo in lavorazione ed eventuali parti metalliche messe a
terra poste nelle vicinanze (accessibili).
Ciò è normalmente ottenibile indossando guanti, calzature,
copricapo ed indumenti previsti allo scopo e mediante l’uso
di pedane o tappeti isolanti.
- Proteggere sempre gli occhi con gli appositi ltri conformi
alla UNI EN 169 o UNI EN 379 montati su maschere o caschi
… 8 …

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