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SUPERIOR TIG 322 AC/DC HF/LIFT 400V+ TIG ACC (816130)
Инструкция по эксплуатации Страница: 9

Telwin SUPERIOR TIG 322 AC/DC HF/LIFT 400V+ TIG ACC (816130) Инструкция по эксплуатации онлайн [9/156] 331519

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Press the torch button, bringing the tip of the electrode close to the piece (2 -3mm),

wait for the arc strike transferred by the HF pulses and, when the arch has struck, form

the weld pool on the piece and proceed along the joint.

If there are difculties in striking the arc even though the presence of gas is conrmed

and the HF discharges are visible, do not insist for long in subjecting the electrode to

HF action, but check the integrity of the surface and the shape of the tip, dressing it

on the grinding wheel if necessary. At the end of the cycle the current will fall at the

slope down setting.

LIFTstrike:

The electric arc is struck by moving the tungsten electrode away from the piece to

be welded. This strike mode causes less electrical-radiation disturbance and reduces

tungsten inclusions and electrode wear to a minimum.

Procedure:

Place the tip of the electrode on the piece, using gentle pressure. Press the torch

button right down and lift the electrode 2-3mm with a few moments’ delay, thus striking

the arc. Initially the welding machine supplies a current I

LIFT

, after a few moments the

welding current setting will be supplied. At the end of the cycle the current will fall to

zero at the slope down setting.

6.1.2TIGDCwelding

TIG DC welding is suitable for all low- and high-carbon steels and the heavy metals,

copper, nickel, titanium and their alloys.

For TIG DC welding with the electrode to the (-) terminal the electrode with 2% thorium

(red band) is usually used or else the electrode with 2% cerium (grey band).

It is necessary to sharpen the tungsten electrode axially on the grinding wheel,

as shown inFIG.L, making sure that the tip is perfectly concentric to prevent arc

deviation. It is important to carry out the grinding along the length of the electrode.

This operation should be repeated periodically, depending on the amount of use and

wear of the electrode, or when the electrode has been accidentally contaminated,

oxidised or used incorrectly. In TIG DC mode 2-stroke (2T) and 4-stroke(4T) operation

are possible.

6.1.3TIGACwelding

This type of welding can be used to weld metals such as aluminium and magnesium,

which form a protective, insulating oxide on their surface. By reversing the welding

current polarity it is possible to “break” the surface layer of oxide by means of a

mechanism called “ionic sandblasting”. The voltage on the tungsten electrode

alternates between positive (EP) and negative (EN). During the EP period the oxide

is removed from the surface (“cleaning”or “pickling”) allowing formation of the pool.

During the EN period there is maximum heat transfer to the piece, allowing welding.

The possibility of varying the balance parameter in AC means that it is possible to

reduce the EP current period to a minimum, allowing quicker welding.

Higher balance values give quicker welding, greater penetration, a more concentrated

arc, a narrower weld pool and limited heating of the electrode. Lower values give a

cleaner piece. If the balance value is too low this will widen the arc and the de-oxidised

part, overheat the electrode with consequent formation of a sphere on the tip making it

more difcult to strike the arc and control its direction. If the balance value is too high

this will create a “dirty” weld pool with dark inclusions.

The table (TAB. 4) summarises the effects of parameter changes in AC welding.

In TIG AC mode 2-stroke (2T) and 4-stroke (4T) operation are possible.

The instructions for this welding procedure are also valid.

The table (TAB. 3) shows suggested values for welding on aluminium; the most

suitable electrode is a pure tungsten electrode (green band).

6.1.4Procedure

- Use the knob to adjust the welding current to the desired value; if necessary adjust

during welding to the actual required heat transfer.

- Press the torch button and make sure the gas ow from the torch is correct; if

necessary, adjust pre-gas and postgas times; these times should be adjusted

according to operating conditions, the postgas delay in particular should be long

enough to allow the electrode and weld pool to cool at the end of welding without

coming into contact with the atmosphere (oxidation and contamination).

TIGmodewith2Tsequence:

- Press the torch button (P.T.) right down to strike the arc with a current of I

START

. The

current will increase according to the START SLOPE UP setting to the welding

current value.

- To interrupt welding, release the torch button so that either the current gradually

decreases (if the FINAL SLOPE DOWN parameter has been enabled) or the arc is

extinguished immediately, followed by postgas.

TIGmodewith4Tsequence:

- The rst time the button is pressed it will strike the arc with a current equal to I

START

When the button is released the current will increase according to the START

SLOPE UP setting to the welding current value; this value is maintained even with

the button is released. When the button is pressed again the current will decrease

according to the FINAL SLOPE DOWN setting, until it reaches I

END

. The I

END

current

will be maintained until the button is released to terminate the welding cycle and

start the postgas phase. If, on the other hand, the button is released while the FINAL

SLOPE DOWN function is proceeding, the welding cycle will terminate immediately

and the postgas phase will start.

TIGmodewith4TandBI-LEVELsequence:

- The rst time the button is pressed it will strike the arc with a current equal to I

START

When the button is released the current will increase according to the START

SLOPE UP setting to the welding current value; this value is maintained even when

the button is released. Now, every time the button is pressed (the time between

pressure and release should be short) the current will change between the setting

for the BI-LEVEL I

parameter and the main current value I

- When the button is kept pressed down for a longer space of time the current will

decrease according to the FINAL SLOPE DOWN setting, until it reaches I

END

. The

END

current will be maintained until the button is released to terminate the welding

cycle and start the postgas phase. If, on the other hand, the button is released while

the FINAL SLOPE DOWN function is proceeding, the welding cycle will terminate

immediately and the postgas phase will start (FIG.M).

6.2MMAWELDING

- 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 - 280

6 200 - 350

- 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).

- The properties of the weld also depend on the ARC-FORCE value (dynamic

behaviour) of the welding machine. The setting for this parameter can be made

either on the panel or using the remote control with 2 potentiometers.

- It should be noted that high ARC-FORCE values achieve better penetration and

allow welding in any position typically with basic electrodes, low ARC-FORCE values

give a softer, spray-free arc typically with rutile electrodes.

The welding machine is also equipped with HOT START and ANTI STICK devices to

guarantee easy starts and to prevent the electrode from sticking to the piece.

6.2.1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.

- 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.N).

7.MAINTENANCE

WARNING! BEFORE CARRYING OUT MAINTENANCE OPERATIONS

MAKESURETHEWELDINGMACHINEISSWITCHEDOFFANDDISCONNECTED

FROMTHEMAINPOWERSUPPLY.

7.1ROUTINEMAINTENANCE

ROUTINE MAINTENANCE OPERATIONS CAN BE CARRIED OUT BY THE

OPERATOR.

7.1.1Torch

- Do not put the torch or its cable on hot pieces; this would cause the insulating

materials to melt, making the torch unusable after a very short time.

- Make regular checks on the gas pipe and connector seals.

- Accurately match collet and collet body with the selected electrode diameter in order

to avoid overheating, bad gas diffusion and poor performance.

- At least once a day check the terminal parts of the torch for wear and make sure they

are assembled correctly: nozzle, electrode, electrode-holder clamp, gas diffuser.

7.2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.

- Periodically, and in any case with a frequency in keeping with the utilisation and with

the environment’s dust conditions, inspect the inside of the welding machine and

remove the dust deposited on the electronic boards with a very soft brush or with

appropriate 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 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.

Telwin SUPERIOR TIG 322 AC/DC HF/LIFT 400V+ TIG ACC (816130) Инструкция по эксплуатации онлайн [9/156] 331519

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