Lichtbogenschweissen - Telwin 953000 Bedienungsanleitung

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WARNING! Always close the gas bottle valve at the end of the job.

6. WELDING: DESCRIPTION OF THE PROCEDURE

6.1 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)

1.6

2.5

3.2

The user must consider that, according to the electrode diameter, higher current

values must be used for flat 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).

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

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

the potentiometer on the control 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 and cellulose electrodes, low ARC-

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

6.1.1 Procedure

Keeping the mask IN FRONT OF THE FACE, rub the tip of the electrode on the piece

to be welded with a movement like striking a match; this is the best way to strike the

arc.

WARNING: DO NOT TAP the electrode on the piece; this risks damaging the coating

and making arc strike difficult.

As soon as the arc has struck, try to keep at a distance from the piece equivalent to

the diameter of the electrode being used and keep this distance as constant as

possible while carrying out the weld; bear in mind that electrode inclination in the

direction of progress should be about 20-30 degrees.

At the end of the welded seam, take the end of the electrode backwards slightly with

respect to the direction of progress, above the crater so as to fill it, then lift the

electrode quickly from the weld pool so that the arc is extinguished. (Appearance of

the weld seam FIG. H)

6.2 TIG WELDING WITH LIFT START

TIG welding is a welding procedure that exploits the heat produced by the electric arc

that is struck, and maintained, between a non-consumable electrode (tungsten) and the

piece to be welded. The tungsten electrode is supported by a torch suitable for

transmitting the welding current to it and protecting the electrode itself and the weld pool

from atmospheric oxidation, by the flow of an inert gas (usually argon: Ar 99.5) which

flows out of the ceramic nozzle.

To achieve a good weld the pieces should be carefully cleaned and free of oxidation, oil,

grease, solvents etc.

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

in FIG. I making sure that the tip is perfectly centred 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.

The electrode diameter should be chosen according to the suggestions given in the

following table, bearing in mind that for 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). T o achieve a good weld it is absolutely necessary to use the exact

electrode diameter with the exact current. The electrode usually protrudes from the

ceramic nozzle by 2-3mm, but protrusion may reach 8mm for corner welding (see TAB.

3).

DEUTSCH

1. ALLGEMEINE SICHERHEITSVORSCHRIFTEN

ZUM LICHTBOGENSCHWEISSEN ............................

2. EINFÜHRUNG UND ALLGEMEINE

BESCHREIBUNG .......................................................

2.1 EINFÜHRUNG ........................................................................................... 12

2.2 AUF ANFRAGE ERHÄLTLICHES ZUBEHÖR............................................. 12

3.TECHNISCHE DATEN..................................................

3.1 TYPENSCHILD MIT DEN GERÄTEDATEN ..............................................

3.2 SONSTIGE TECHNISCHE DA TEN ...........................................................

4. BESCHREIBUNG DER SCHWEISSMASCHINE ......

4.1 STEUERUNGS-, REGELUNGS UND VERBINDUNGSEINRICHTUNGEN

4.1.1 HINTERE TAFEL ............................................................................. 13

4.1.2 VORDERE TAFEL............................................................................. 13

5. INSTALLATION ...........................................................

5.1 EINRICHTUNG.......................................................................................... 13

5.1.1 Zusammensetzen Stromrückleitungskabel und Klemme................. 13

INVERTERSCHWEISSMASCHINEN ZUM WIG- UND MMA-SCHWEISSEN IN

INDUSTRIE UND GEWERBE.

Anmerkung: Im folgenden Text wird der Begriff "Schweißmaschine" gebraucht.

ALLGEMEINE SICHERHEITSVORSCHRIFTEN ZUM

Welding current (A)

Min.

Max.

110

160

INHALTSVERZEICHNIS

6.2.1 Procedure

- Strike: Place the tip of the electrode on the piece, using slight pressure. Lift the

electrode up 2-3mm with a brief delay, thus obtaining arc strike with the current value

corresponding to that of the setting.

- To interrupt welding, lift the electrode quickly away from the piece.

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 OPERATIONS SHOULD BE CARRIED OUT

ONLY AND EXCLUSIVEL Y BY SKILLED OR AUTHORISED ELECTRICAL-

MECHANICAL TECHNICIANS.

_____________________________________________________________________________________________________________________

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 rectifier using a jet of dry compressed air (max. 10 bar).

- 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.

8. TROUBLESHOOTING

IN CASE OF UNSATISF ACTORY 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.

5.1.2 Zusammensetzen Schweißkabel und Elektrodenklemme ............... 13

5.2 ANHEBEN DER SCHWEISSMASCHINE .................................................

5.3 AUFSTELLUNG DER SCHWEISSMASCHINE.........................................

5.4 NETZANSCHLUSS....................................................................................

5.4.1 Stecker und buchse...........................................................................

5.5 ANSCHLÜSSE DES SCHWEISSSTROMKREISES .................................

5.5.1 MMA-Schweißen..............................................................................

5.5.2 WIG-Schweißen mit LIFT-Start .........................................................

6. SCHWEISSEN: VERFAHRENSBESCHREIBUNG.....

6.1 MMA SCHWEISSEN ................................................................................

6.1.1 Vorgehensweise...............................................................................

6.2 WIG-SCHWEISSEN MIT LIFTSTART .......................................................

6.2.1 Vorgehensweise...............................................................................

7. WARTUNG..................................................................

7.1 PLANMÄSSIGE WARTUNG ...................................................................... 14

7.1.1 Brenner............................................................................................. 14

7.2 AUSSERPLANMÄSSIGE WARTUNG........................................................ 14

8. FEHLERSUCHE .........................................................