Bedienungsanleitung Telwin LINEAR 280 (Seite 7 von 84) (Alle Sprachen)

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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 efciency.

- 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

These welding machines are direct current power sources, suitable

for arc welding using electrodes with a range of coatings (rutile, acid,

basic).

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)).

The value of the current setting (I

) can be read on the graduated

scale in Amps (FIG. B (4)) on the front panel.

The current shown corresponds to the arc voltage (U

) according to

the following relationship:

= (20 + 0.04 I

) V (EN 60974).

WELDING

- Almost all stick electrodes are to be connected to the positive pole

(+) of the power source, only exceptionally to the negative pole (-)

(acid covering).

- 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) Weldingcurrent(A)

min. max.

1.6 25 - 50

2 40 - 80

2.5 60 - 110

3.2 80 - 160

4 120 - 200

5 150 - 250

6 200 - 350

8 350 - 550

- The user must consider that, according to the electrode diameter,

higher current values must be used for at 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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. H).

- 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. I

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, 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.).

- 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.

Telwin LINEAR 280 Seite 7

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