Telwin Etronithy 400 Manual De Instrucciones página 6

Ø Electrode (mm)
1.6
2
2.5
3.2
4
5
6
7
- 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.
- The mechanical character of the weld will be determined
not only by the current intensity used, but also by other
parameters such as the diameter and quality of the
electrode, the arc length , the speed and position of the
user. It will also depend on the state of the electrodes in
use, which should be protected from damp by their
packaging.
- The welding characteristics depend also on the value of the
ARC FORCE (dynamic behaviour) of the machine.
This parameter can be set by means of the remote control
with two potentiometer. Remember that higher values of
ARC FORCE result in a higher penetration and enable
welding in any position using basic electrodes. On the other
hand, lower values of ARC FORCE result in a softer arc
without sparks using rutile electrodes (just for the I
max=500A version).
Welding 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 difficult.
- 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.O).
- At the end of the weld bead, bring the end of the electrode
backward, in order to fill the weld crater, quickly lift the
electrode from the weld pool to extinguish the arc.
CHARACTERISTICS OF THE WELD BEAD (Fig. P)
DESEAMING
This procedure refers to an electric arc between a special
carbon electrode (coated with a thin layer of copper and
powered by direct current) and the piece to be grooved; the
arc melts the metal locally and a jet of compressed air at 6÷7
atm provides for the removal of the metal.
Deseaming requires a special clamp for the electrode (not
supplied), which is connected to the (+) positive pole of the
power source, and a valve activated by a lever on the clamp
grip, which controls the compressed air.
The carbon electrode is attached to the clamp with a
protrusion of 70÷150 mm and is kept at about 45° to the piece
being cut.
For grooving, the angle can reduced to as low as 20°.
The depth of the groove will depend on this angle and on the
feed rate of the electrode.
- The following are approximate values for the currents used
for the different electrode diameters, for the required air
pressure and related air consumption:
Ø Electrode (mm)
4
5
6.3
8
TERMINAL :
AIR PRESSURE :
CONSUMPTION :
Welding current (A)
Min.
25 -
40 -
60 -
80 -
120 -
140 -
200 -
280 -
Amps
Min. Max.
80
-
110 -
150 -
200 -
+
6÷7 atm
700-800 L/Min
Max. 7. MAINTENANCE
50 ______________________________________________
80
110 WARNING!
160
MAINTENANCE OPERATIONS MAKE SURE THE
200
WELDING MACHINE IS SWITCHED OFF AND
250
DISCONNECTED FROM THE MAIN POWER SUPPLY.
350
______________________________________________
450
EXTRAORDINARY MAINTENANCE
EXTRAORDINARY MAINTENANCE OPERATIONS
SHOULD BE CARRIED OUT ONLY AND EXCLUSIVELY
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,
2
and remove the dust deposited using a jet of dry
compressed air (max. 10bar).
- 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 UNSATISFACTORY 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 mains voltage. If it is either over 460V ac or under
340V ac the machine does not function. When voltage is
within these values the re-startis automatic (just for the I
max=500A version).
WARNING: MAINS VOLTAGE OVER 480V A.C. CAN DAM
AGE THE MACHINE.
- 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-
150
coverings (ie. Paint).
200
350
450
- 6 -
BEFORE CARRYING OUT
2