Telwin TECHNOMIG 225 DUAL SYNERGIC Bedienungsanleitung Seite 9

2T mode:
welding begins when the torch push-button is pressed and ends when the push-button is
released.
4T mode:
welding begins when the torch push-button is pressed and released, and ends only when
the torch push-button is pressed and released a second time. This mode is useful for long
welding operations.
Spot welding mode:
used for MIG/MAG spot welding with control of welding duration.
9. UNIT OF MEASUREMENT MENU (Fig. O)
Both in manual and synergic mode to access the menu, simultaneously press the knobs (Fig.
C1) and (Fig. C2) for at least 1 second and release them. Turn the knob (Fig. C2) until menu
3 appears. Confirm selection by pressing the knob again. Now you can set the metric or
imperial units of measurement. Pressing knob C-2 again, you return to manual (or synergic)
mode.
10. INFO MENU (Fig. O)
Both in manual and synergic mode to access the menu, simultaneously press the knobs (Fig.
C1) and (Fig. C2) for at least 1 second and release them. Turn the knob (Fig. C2) until menu 4
appears. Confirm selection by pressing the knob again; turning the knob C-2 you can obtain
information on the software installed. Pressing knob C-2 again, you return to manual (or
synergic) mode.
11. TIG DC WELDING: PROCESS DESCRIPTION
11.1 GENERAL PRINCIPLES
TIG DC welding is suitable for all types of low-alloy and high carbon steel, and heavy metals
such as copper, nickel, titanium and their alloys (FIG. P). An electrode with 2% Cerium (grey
band) is normally used for TIG DC welding with electrode at the (-) pole. The tungsten
electrode must be axially sharpened using a grinding wheel, see FIG. Q; make sure the tip
is perfectly concentric to prevent arc deviation. The electrode must be ground along its
length. This operation must be repeated periodically according to the use and wear state
of the electrode, or when the electrode itself has been accidentally contaminated, oxidised
or used incorrectly. For the welding to be good, the exact diameter of the electrode must
be used with the exact current, see table (TAB. 5). The electrode normally projects from the
ceramic nozzle by 2-3 mm, but can reach 8 mm for welding edges.
The weld is created by the edges that melt. Filler metal is not needed when welding suitably
prepared thin material (up to about 1 mm) (FIG. R). A greater thickness requires rods made
from the same material as the basic material and with a suitable diameter, with edges that
have been suitably prepared (FIG. S). For welding to be successful, the pieces must be
carefully cleaned and free from oxide, grease, oil, solvent, etc.
11.2 PROCEDURE (LIFT STRIKE)
- Use the knob C-1 to adjust the welding current at the required value;
Adjust the current during welding to the true thermal ratio that is required.
- Make sure the gas is flowing correctly.
The arc ignites through contact, distancing the tungsten electrode from the workpiece.
Igniting in this manner causes less electric-irradiated disturbances and reduces tungsten
inclusions and electrode wear to a minimum.
- Place the tip of the electrode on the workpiece, pressing gently.
- Immediately lift the electrode by 2-3 mm to obtain the ark strike.
The welding machine initially supplies reduced current. After a few seconds, the set
welding current is issued.
- Quickly lift the electrode from the workpiece to interrupt welding.
11.3 LCD DISPLAY IN TIG MODE (Fig. C)
- TIG operation mode;
Welding values;
welding voltage;
welding current.
12. MMA WELDING: PROCESS DESCRIPTION
12.1 GENERAL PRINCIPLES
- It is essential to follow the recommendations provided by the manufacturer on the
electrode packaging which indicates the correct electrode polarity and relative rated
current.
- Welding current is regulated to suit the diameter of the electrode being used and the type
of soldering to be performed; an example of the currents used for the various electrode
diameters can be seen below:
Ø Electrode (mm)
1.6
2.0
2.5
3.2
4.0
5.0
6.0
- One can see that for the same diameter electrode, high levels of current will be used for
flat welding, whilst lower current levels will be used for vertical or overhead welding.
- The mechanical characteristics of the welded joint are determined by the intensity of
the selected current and also other welding parameters such as the length of the arc,
the operating speed and position, the diameter and quality of the electrodes (to ensure
correct conservation, use special packaging or containers to store and protect the
electrodes against humidity).
WARNING:
Instability of the arc due to the composition of the electrode can occur, depending on the
brand, type and thickness of the electrode coatings.
Welding current (A)
Min. Max.
25 50
40 80
60 110
80 150
140 200
180 250
240 270
12.2 Procedure
- Hold the mask IN FRONT OF THE FACE, then lightly scratch the electrode tip on the piece
to be welded as if you were trying to strike a match; this is the correct way of striking the
arc.
WARNING: DO NOT TAP the electrode against the piece; this can damage the coating and
make it difficult to strike the arc.
- A soon as the arc is struck, try to maintain a distance from the piece which is equivalent
to the diameter of the electrode being used, and try to maintain this distance as constant
as possible during the welding operations; remember that the angle of the electrode as it
moves forwards should be about 20-30 degrees.
- At the end of the welding seam, move the electrode tip backwards slightly, above the
crater, and fill it in; now quickly lift the electrode from the weld pool to extinguish the arc
(Examples of welding seams - FIG. T).
12.3 LCD DISPLAY IN MMA MODE (Fig. C)
- MMA operation mode;
- Welding values;
welding voltage;
welding current;
- recommended electrode diameter.
Press the knobs (Fig. C1) and (Fig. C2) for at least 1 second and release to access the
advanced parameter settings menu. Each parameter can be set to the desired value by
rotating/pressing the knob (Fig. C2) until you exit the menu.
: this is the initial "HOT START" overcurrent, the display shows the percentage
increase as to the value of the selected welding current. Settings from 0 to 100%. Factory
value: 50%.
: this is the dynamic "ARC-FORCE" overcurrent, the display shows the percentage
increase as to the value of the pre-selected welding current. This adjustment improves
welding fluidity, prevents the electrode from adhering to the workpiece and makes it
possible to use different types of electrodes.
Settings from 0 to 100%. Factory value: 50%.
: ON/OFF; this enables or disables the device that reduces the loadless output
voltage (ON or OFF setting). Factory value: OFF. With the VRD enabled, operator safety
increases when the welding machine is on but not in the welding mode.
13. RESET FACTORY SETTINGS
The welding machine can be taken back to the factory settings by keeping the two knobs
(Fig.C-1) and (Fig.C-2) pressed during starting operation.
14. ALARM WARNINGS
Reset is automatic when the reason for alarm activation stops.
Alarm messages that can appear on the display:
- ALARM 01 and " ": Welding primary thermal switch has tripped. Operations come to
a halt until the machine has cooled down sufficiently.
- ALARM 02 and " ": Welding secondary thermal switch has tripped. Operations come
to a halt until the machine has cooled down sufficiently.
- ALARM 03: overvoltage switch has tripped. Check the power supply voltage.
- ALARM 04: undervoltage switch has tripped. Check the power supply voltage.
- ALARM 10: welding circuit overcurrent switch has tripped. Make sure the feeder speed
and/or welding current are not too high.
- ALARM 11: torch and earthing short-circuit switch has tripped. Make sure the welding
circuit has not short-circuited.
- ALARM 13: no internal communication switch has tripped. If the alarm continues, contact
an authorised repair centre.
- ALARM 18: auxiliary voltage alarm switch has tripped. If the alarm continues, contact an
authorised repair centre.
When the welding machine is switched off, the signal ALARM 04 may appear for a few
seconds.
15. MAINTENANCE
WARNING! BEFORE CARRYING OUT MAINTENANCE OPERATIONS MAKE
SURE THE WELDING MACHINE IS SWITCHED OFF AND DISCONNECTED
FROM THE MAIN POWER SUPPLY.
15.1 ROUTINE MAINTENANCE:
ROUTINE MAINTENANCE OPERATIONS CAN BE CARRIED OUT BY THE OPERATOR.
15.1.1 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.
- Before using the welding machine, always check the terminal parts of the torch for wear
and make sure they are assembled correctly: nozzle, electrode, electrode-holder clamp,
gas diffuser.
15.1.2 Wire feeder
- Make frequent checks on the state of wear of the wire feeder rollers, regularly remove the
metal dust deposited in the feeder area (rollers and wire-guide infeed and outfeed).
15.2 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.
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