Telwin INVERPULSE 625 MIG Manual De Instrucciones página 11

because also in this case we have two work points set with the same criteria as the
bi-level (FIG. D (LED (10a) and (10b)). The duration of each level t
be set (FIG. D (LED (10c) and (10d)) and are not set manually, as happens instead
with bi-level. During welding the machine therefore continues switching the working
point automatically from the main level (duration t
The phenomenon created is that of having a pulsation in a pulsation, hence the name.
By setting the two levels and the two durations correctly it is possible to obtain wave
welding that is very similar to TIG welding
6.2 TIG WELDING (DC)
After making the welding circuit connections as described in section 5.5.2 it is
necessary to:
- Select the TIG welding procedure on the welding machine control panel (FIG.C (5)).
- Set the welding current to the desired value using the encoder knob (FIG. C (4)),
(the value can always be adjusted during welding as well).If necessary insert the
current down slope using the key (FIG. C (4a)) (momentary indication on the display
(FIG. C (3)).
6.2.1 LIFT strike
Place the tip of the electrode on the piece, using slight pressure. Press the torch button
right down and lift the electrode by 2-3 mm with a slight delay, so that the arc strikes.
The welding machine will first output a base current I
current output will be equal to the welding current setting. At the end of the cycle the
current will decrease according to the slope down setting.
Table (TAB. 5) summarises some indicative data for welding stainless or high alloy
steel.
6.3 WELDING WITH MMA COATED ELECTRODE
After making the welding circuit connections as described in section 5.5.3 select the
MMA procedure using the corresponding button (FIG. C (5)):
Set the welding current to the desired value using the encoder knob (FIG. C (4)) and
any possible "ARC FORCE" dynamic overcurrent can be varied from between 0 and
100% using the encoder knob (FIG. C (4)), with a momentary indication of the value
on the display (FIG. C (3)).
The table (TAB. 6) summarises some indicative values for the current in relation to
electrode diameter.
6.4 WELD QUALITY
The quality of the weld seam, and the amount of spatter, is mainly determined by the
balance of the welding parameters: current (wire feed rate), wire diameter, arc voltage
etc.
In addition, the position of the torch should be adjusted as shown in Fig. M, to prevent
excessive spray production and flaws in the seam.
The welding rate (i.e. advancement speed along the join) should also be taken into
consideration. This is a determining factor for correct penetration and for the shape
of the seam itself.
The most common welding flaws are summarised in the table (TAB. 7).
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.
- Every time the wire reel is changed, blow out the wire-guide hose using dry
compressed air (max. 5bar) to make sure it is not damaged.
- At least once a day, check the wear and correct assembly of the parts at the end of
the torch: nozzle, contact tip, gas diffuser.
7.1.2 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).
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 (TAB.8)
WARNING! CARRYING OUT CERTAIN CHECKS IMPLIES THE RISK OF
CONTACT WITH LIVE AND/OR MOVING PARTS.
IF THE WELDING MACHINE IS NOT WORKING PROPERLY, BEFORE MAKING
and t can both
1 2
) to the secondary level (duration t
1
, after a few moments the
BASE
MORE SYSTEMATIC CHECKS OR CALLING YOUR SERVICING CENTRE MAKE
THE FOLLOWING CHECKS:
- Make sure the welding current (adjusted using the encoder) is correct.
- Make sure there is no alarm indicating triggering of the thermal relay or of the
). overvoltage, undervoltage or short circuit safeguards.
2
- Make sure you have not exceeded the rated duty cycle; if the thermal cutout has
triggered wait until the welding machine has cooled naturally, make sure the fan is
working properly.
- Check the main power supply voltage: if it is too low or too high the welding machine
will signal this fault (see section 4.2).
- Make sure there is no shorting at welding machine output: in such a case eliminate
the problem.
- Make sure the welding circuit connections have been made correctly, in particular
that the earth clamp is actually connected to the piece, with no insulating material
(e.g. paint) in the way .
- Make sure you are using the right protective gas, and the correct amount.
Before carrying out any work on the wire feeder or inside the welding machine, first
consult chapter 7 on "MAINTENANCE".
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