Telwin ELECTROMIG 230 WAVE 400V Bedienungsanleitung Seite 9

- : Secondary arc correction according to preset arc voltage;
- : Secondary wire feed speed;
- : Secondary material thickness;
- : Duration of I current;
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- : Duration of I current.
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8. CONTROLLING THE TORCH PUSH-BUTTON
8.1 Torch push-button control mode
It is possible to set 4 different torch push-button control modes:
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.
4T Bi-Level mode
Welding begins when the torch push-button is pressed and released. Each time it is
pressed/released it switches from current (I
versa. It only terminates when the torch push-button is pressed for a certain set time.
Spot welding mode
Used for MIG/MAG spot welding with control of welding duration.
8.2 Setting the torch push-button control mode
Press the knob (Fig. B-5) for at least 3 seconds to access the parameter settings
menu.
9. MMA WELDING: PROCESS DESCRIPTION
9.1 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
- 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.
9.2 PROCEDURE
- Keeping the mask IN FRONT OF YOUR FACE, rub the tip of the electrode on the
piece to be welded, moving as if striking a match; this is the most correct method for
igniting the arc.
WARNING: DO NOT TAP the electrode against the workpiece, which could
damage the coating and make arc striking difficult.
- As soon as the arc has struck, try to keep the electrode at a distance from the
workpiece that is equivalent to the diameter of the electrode being used, and keep
this distance as constant as possible while welding; remember that the electrode
angle while moving forward must be approx. 20-30 degrees.
- At the end of the welding seam, take the electrode end slightly back as to the forward
direction, above the crater to fill it, then quickly lift the electrode from the weld pool
to switch off the arc (Aspects of the welding seam - FIG. M).
9.3 MMA mode settings (Fig. L-8)
The user can customise the following welding parameters (Fig. L-9):
- : ON/OFF: this enables or disables the device that reduces the loadless
output voltage (ON or OFF setting). With the VRD enabled, operator safety increases
when the welding machine is on but not in the welding mode.
- : This is the initial "HOT START" overcurrent, the display shows the
percentage increase as to the value of the selected welding current. This adjustment
symbol) to current (I symbol) and vice-
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Welding current (A)
Min. Max.
25 50
40 80
60 110
80 170
improves starting.
- : Welding current measured in Amperes.
- : 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.
The actual welding settings (welding current and voltage) are shown in the left section
of the display.
10. TIG DC WELDING: PROCESS DESCRIPTION
10.1 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. N). 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. O;
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. P).
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. Q).
For welding to be successful, the pieces must be carefully cleaned and free from
oxide, grease, oil, solvent, etc.
10.2 PROCEDURE (LIFT STRIKE)
- Use the knob B-5 to adjust the welding current to the required rate; adjust this value
during welding processes to adapt to the actual heat transfer 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.
10.3 LCD DISPLAY IN TIG MODE (Fig. L-10)
The actual welding settings (welding current and voltage) are shown in the left section
of the display.
11. ALARM SIGNALS (TAB. 6)
Reset is automatic when the reason for alarm activation stops.
Alarm messages that can appear on the display:
DESCRIPTION
Thermal protection alarm
Overvoltage/undervoltage alarm
Auxiliary voltage alarm
Welding overcurrent alarm
Torch short-circuit alarm
Off-line alarm
Line-error alarm
When the welding machine is switched off, the Over/under voltage alarm signal may
appear for a few seconds.
12. SETTINGS MENU (Fig. L-11)
12.1 SET UP MENU (Fig. L-12)
Used to set the language, date/time, function lock, units of measure in inches/metric.
12.2 SERVICE MENU (Fig. L-13)
Used to obtain various information, for firmware updates, to prepare reports, calibration
of measurements taken by the welding machine.
12.3 JOBS MENU (Fig. L-14)
Used to save, retrieve, import and export customised software.
13. MAINTENANCE
WARNING! BEFORE CARRYING OUT MAINTENANCE OPERATIONS
MAKE SURE THE WELDING MACHINE IS SWITCHED OFF AND DISCONNECTED
FROM THE MAIN POWER SUPPLY.
13.1 ROUTINE MAINTENANCE:
ROUTINE MAINTENANCE OPERATIONS CAN BE CARRIED OUT BY THE
OPERATOR.
13.1.1 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.
13.1.2 Wire feeder
- Make frequent checks on the state of wear of the wire feeder rollers, regularly
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