Gas Connection; Instructions For Use; Loading Wire; Welding - CEA SMARTMIG T21 Manual De Instrucciones

Gas connection

The units are supplied with a pressure
reducer complete with pressure gauge for
adjustment of the pressure of the gas used
in welding. The gas cylinders (Max height
1200 mm) must be placed on the rear cyl-
inder-support platform of the welding
machine and secured with the chain sup-
plied. They must be installed in a way that
does not interfere with the stability of the
welding machine. The connections
between the gas tank, reducer and gas
pipe, from the back panel of the welder, to
be made as shown in fig. C.
Open the gas cyclinder and regulate the
flowmeter to about 8/12 l/min.
WARNING: Check that the gas used is
compatible with the material to be welded.

Instructions for use

COMMAND AND CONTROL UNITS (fig. D)
Pos. 1 Euro type torch connection.
Pos. 2 Potentiometer with switch for regulating the spot
welding time.
Pos. 3 Switch for regulating the welding voltage.
Pos. 4 Thermostatic protection warning light. When on, it
indicates that thermal protection is operating. You are
working beyond the work cycle (see "Limits of use").
Wait a few minutes before continuing the welding.
Pos. 5 On/Off switch.
Pos. 6 Potentiometer for adjustment of wire speed.
1
Fig. D

Loading wire

• Lift the latch on the left side panel and insert a spool, (Use
spools of 300 mm MAX and 20 kg MAX) that is compatibile
with the material to be welded. Place the spool on the
appropriate support so that the wire winds clockwise and
insert the protruding pin on the support into the hole in the
spool.
• Release the lever (pos. 1, fig. E) and raise the arm that holds
the idle spool (pos. 2. fig. E).
• Check that the inside of the motor rotor (see fig. F) has the
diameter of the wire used printed on it.
• Insert the wire into the appropriate rear guide (pos. 4, fig. E)
located on the feeding mechanism until it passes through
the inside of the front guide (pos. 3, fig. E) for a few centime-
ters.
Fig. C
2 3
6 5
1
4
Fig. E
• Lower the arm supporting the idle spool (pos. 2, fig. E) and
close the lever (pos. 1, fig. E) making sure the wire enters the
groove of the motor rotor.
• Use the special handgrip to adjust
the rollers (pos. 1, fig. E). The cor-
rect pressure is the minimum that
does not allow the rollers to skid
on the wire. Excessive pressure
will case deformation of the wire
and tangling on the entrance of
the sheath; insufficient pressure
can cause irregular welding.

Welding

IMPORTANT: Before welding, check that the data on the
power source plate correspond to the supply voltage and fre-
quency.
• Turn on the welding machine and turn the welding voltage
switch (pos. 3, fig. D) to the correct position for the work to
be done.
• Remove the gas-guide and wire-guide nozzles, allowing the
wire to flow freely during loading. Remember that the con-
tact tip must correspond to the wire diameter.
• Set the wire speed potentiometer on position 3 (pos. 6, fig.
D).
• Push the torch push button or the motor check push button
until the wire end comes out from the torch.
• Tighten the contact tip on the torch.
• Attach the correct gas-guide nozzle.
4
• Protect the gas-guide nozzle and the wire-guide nozzle of
the torch from sprays of solder.
• Connect the clamp of the ground lead to the piece to be
welded (see fig. G).
• The welding machine is ready for welding.
• To begin welding, approach the point to be welded and
press the button on the torch.
• When you have finished welding, remove the waste, turn off
the machine and close the gas cylinder.
CONTINUOUS WELDING
Select the most suitable wire tension adjustment and speed,
using the respective controls, in function of the type of work to
be carried out. Press the torch button to start the welding cur-
rent and advancement of the wire and perform welding. After
completely the weld, release the torch button to stop the wire
advancement motor immediately. The generator is powered for
a few seconds, long enough to burn the excess wire emerging
from the torch. The gas solenoid remains open to provide for
maintaining an inert atmosphere around the welding zone. This
function is called "burn-back" and is adjustable. The control
circuit is powered, ready for the next welding cycle.
SPOT WELDING
This type of welding is recommended for repairs in automobile
body shops.
• Replace the gas-guide nozzle with the special type for spot
welding (see fig. H)
• Set the spot welding time with the potentiometer (pos. 2, fig.
D)
9
2
3
2000H850
Fig. F