Manual Telwin Infinity 180 (page 7 of 104) (All languages)

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Assembling the welding cable-electrode holder clamp

Fig. F

HOW TO LIFT THE WELDING MACHINE

All the welding machines described in this handbook should be lifted

using the handle or strap supplied if provided for the particular model

(tted as described in FIG. L).

POSITION OF THE WELDING MACHINE

Choose the place to install the welding machine so that the cooling air

inlets and outlets are not obstructed (forced circulation by fan, if present);

at the same time make sure that conductive dusts, corrosive vapours,

humidity etc. will not be sucked into the machine.

Leave at least 250mm free space around the welding machine.

WARNING! Position the welding machine on a at surface

with sucient 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.

- To ensure protection against indirect contact use residual current

devices of the following types:

- Type A (

) for single phase machines;

- Type B (

) for 3-phase machines.

- To comply with the requirements of the EN 61000-3-11 (Flicker)

standard we recommend connecting the welding machine to interface

points of the power supply that have an impedance of less than:

Zmax = 0.47 ohm (80A).

Zmax = 0.24 ohm (130A - 170A).

Zmax = 0.17 ohm (200A).

- the welding machine does not fall within the requisites of IEC/EN

61000-3-12 standard.

Should it be connected to a public mains system, it is the installer’s

responsibility to verify that the welding machine itself is suitable

for connecting to it (if necessary, consult the distribution network

company).

- Unless otherwise specied (MPGE), the welding machines are

compatible with power generating sets for voltage oscillations up to ±

15%.

For correct use, the power generating set must be brought to steady

conditions before being able to connect the inverter.

- PLUG AND OUTLET:

- The 230V model is tted at the factory with a power supply cable

and normalised plug, (2P + T) 16A/250V .

It can therefore be connected to a mains outlet tted 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 (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 welding machines without a plug (115/230V models), connect

a normalised plug (2P + T) - having sucient capacity- to the power

cable and prepare a mains outlet tted 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

(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.

WARNING! Failure to observe the above rules will make the

(Class 1) safety system installed by the manufacturer ineective with

consequent serious risks to persons (e.g. electric shock) and objects

(e.g. re).

CONNECTION OF THE WELDING CABLES

WARNING! BEFORE MAKING THE FOLLOWING

CONNECTIONS MAKE SURE THE WELDING MACHINE IS SWITCHED

OFF AND DISCONNECTED FROM THE POWER SUPPLY OUTLET.

Table (TAB. 1) gives the recommended values for the welding cables

(in mm

) depending on the maximum current supplied by the welding

machine.

MMA WELDING

Almost all coated electrodes are connected to the positive pole (+) of

the power source; as an exception to the negative pole (-) for acid coated

electrodes.

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 e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

- 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

- 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.

- As well as being determined by the chosen current intensity, the

mechanical characteristics of the welded join are also 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 in a dry place protected by their packaging or containers).

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 di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

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Telwin Infinity 180 Manual

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