Telwin Technomig 200, Instruction Manual

Page: 9 / 200

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Connecting the torch
Engage the torch (Fig. B (4)) with its dedicated connector MIG by
tightening the locking ring manually as far down as it will go. Prepare
the wire for loading the first time by dismantling the nozzle and the
contact tube to ease its exit.
FLUX WELDING
The connections for the earth return cable and the torch are the same
as those for MIG/MAG welding, it is necessary to change the voltage
polarity (FIG.B (9)-(10)) in the reel compartment, as shown on the
label.
Connecting the spool gun (Fig. B)
Connect the spool gun to the centralised torch connection (4)
screwing the ring nut right down to fasten it. Then insert the control
cable connector in the special socket (5) . The welding machine will
recognise the spool gun automatically.
TIG WELDING
Connection to the gas bottle
- The gas bottle can be loaded onto the supporting platform of the
trolley max. 60 kg .
- Screw the pressure reducing valve onto the gas bottle valve,
inserting the appropriate adapter supplied as an accessory, for
when the gas used is Argon.
- Connect the gas input pipe to the reduction valve and tighten the
clip supplied; then connect the other end of the pipe to the cock
connector provided on the TIG torch.
- Loosen the adjustment ring nut on the pressure-reducing valve
before opening the bottle valve.
Connecting the welding current return cable
- This is connected to the piece being welded or to the metal bench
supporting it, as close as possible to the join being made.
- This cable is connected to the terminal with the symbol (+).
Connecting the torch (Fig. M)
- Connect the TIG torch to the quick connection (-) on the front panel
of the welding machine;
MMA welding
Practically all coated electrodes are connected to the positive
terminal (+) of the power source, with the exception of acid-coated
electrodes which are connected to the negative terminal (-).
Connecting the electrode-holder clamp welding cable
Put a special clamp on the terminal which serves to close the
uncovered part of the electrode.
This cable should be connected to the terminal with the symbol (+).
Connecting the welding current return cable
This is connected to the piece to be welded or to the metal bench on
which it rests, as close as possible to the joint being made.
This cable should be connected to the terminal with the symbol (-).
WARNINGS
- Turn the welding cable connectors right down into the quick
connections, to ensure a perfect electrical contact; otherwise
the connectors themselves will overheat, resulting in their rapid
deterioration and loss of efficiency.
- The welding cables should be as short as possible.
- Do not use metal structures which are not part of the workpiece
to substitute the return cable of the welding current: this could
jeopardise safety and result in poor welding.
LOADING THE WIRE REEL (Fig. G)
WARNING! BEFORE STARTING THE OPERATIONS
TO LOAD THE WIRE MAKE SURE THE WELDING MACHINE
IS SWITCHED OFF AND DISCONNECTED FROM THE MAIN
POWER SUPPLY OUTLET.
MAKE SURE THAT THE WIRE FEEDER ROLLERS, THE WIRE
GUIDE HOSE AND THE CONTACT TIP OF THE TORCH MATCH
THE DIAMETER AND TYPE OF WIRE TO BE USED AND MAKE
SURE THAT THESE ARE FITTED CORRECTLY. WHEN INSERTING
AND THREADING THE WIRE DO NOT WEAR PROTECTIVE
GLOVES.
- Open the reel compartment door.
- Position the wire reel on the spindle, holding the end of the wire
upwards; make sure the tab for pulling the spindle is correctly
seated in its hole
(1a)
.
- Release the pressure counter-roller(s) and move them away from
the lower roller(s)
(2a)
;
- Make sure that the towing roller(s) is suited to the wire used (2b) .
- Free the end of the wire and remove the distorted end with a clean
cut and no burr; turn the reel anti-clockwise and thread the end of
the wire into the wire-guide infeed, pushing it 50-100mm into the
wire guide of the torch fitting (2c) .
- Re-position the counter-roller(s), adjusting the pressure to an
intermediate value, and make sure that the wire is correctly
positioned in the groove of the lower roller(s)
(3)
- Use the adjustment screw located at the centre of the spindle to
apply a slight braking pressure on the spindle itself
(1b)
.
- Remove the nozzle and contact tip (4a) .
- Insert the welding machine plug in the power supply outlet, switch
on the welding machine, press the torch button and wait for the end
of the wire to pass through the whole of the wire guide hose and
protrude by 10-15 cm from the front part of the torch, release the
button.
WARNING! During these operations the wire is live and
subject to mechanical stress; therefore if adequate precautions
are not taken the wire could cause hazardous electric shock,
injury and striking of electric arcs:
- Do not direct the mouthpiece of the torch towards parts of the body.
- Keep the torch away from the gas bottle.
- Re-fit the contact tip and the nozzle onto the torch (4b) .
- Check that wire feed is regular; set the roller and spindle braking
pressure to the minimum possible values making sure that the wire
does not slide in the groove and when feed is halted the loops of
wire are not loosened by excessive reel inertia.
- Cut the end of the wire so that 10-15 mm protrude from the nozzle.
- Close the reel compartment door.
LOADING THE WIRE REEL ONTO THE SPOOL GUN (Fig. H)
WARNING! BEFORE STARTING THE OPERATIONS
TO LOAD THE WIRE MAKE SURE THE WELDING MACHINE
IS SWITCHED OFF AND DISCONNECTED FROM THE MAIN
POWER SUPPLY OR THAT THE SPOOL GUN IS DISCONNECTED
FROM THE WELDING MACHINE.
MAKE SURE THE WIRE PULLER ROLLERS, THE WIRE GUIDE
HOSE AND THE SPOOL GUN CONTACT TUBE HAVE SUITABLE
DIAMETERS CORRESPONDING TO THAT OF THE WIRE TO BE
USED AND MAKE SURE THEY ARE ASSEMBLED CORRECTLY.
DO NOT WEAR PROTECTIVE GLOVES WHEN THREADING IN
THE WIRE.
- Remove the cover by undoing the appropriate screw (1) .
- Position the wire reel on the reel holder.
- Free the pressure counter-roller and move it away from the lower
roller
(2)
.
- Free the end of the wire, cut off the distorted end with a clean cut
leaving no burrs; turn the reel anti-clockwise and thread the end of
the wire into the wire-guide infeed, pushing it 50-100mm inside the
lance
(2)
.
- Reposition the counter-roller, adjusting the pressure to an
intermediate value and make sure the wire is correctly positioned
in the lower roller recess (3) .
- Brake the reel holder slightly by adjusting the appropriate screw.
- Switch on the welding machine, putting the switch to ( I ), press the
spool gun button and wait until the end of the wire runs through the
complete wire guide hose and 10-15 cm comes out of the front of
the torch then release the torch button.
- With the Spool gun connected, switch on the machine, press the
spool gun button and wait for the end of the wire to pass completely
through the wire guide hose and for 10-15 cm to come out of the
front of the torch, release the torch button.
REPLACING THE LINER IN THE TORCH (FIG. I)
Before proceeding to replace the hose, lay out the torch cable
straight without any bends.
Coiled hose for steel wires
1- Unscrew the nozzle and contact tip on the torch head.