Fimer T252, Original Instructions Manual

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8
This makes the TIG procedure particularly
suitable for precision welding on a wide variety
of thicknesses, in difficult positions and on pipes
which require full penetration.
The TIG procedure can be used on various types
of metals, such as, ferrous materials, alloys,
nickel, copper, titanium, magnesium. During
welding, potentiometer 8 in fig. 1, for example,
regulates the welding current.
The correct connection of the torch and earth
cable is shown in the following table:
6. CONNECTOR FOR TIG WELDING
1) Connect the earth cable to the appropriate ‘+’ socket
on the front of the device (15 of Fig .1) . Insert by lining-
up the key with the groove and turn in a clockwise
direction until it stops. Do not fasten too tightly!
2) Connect the torch to the appropriate ‘-‘ socket on
the front of the device (17 of Fig .1) .
3) Insert by lining-up the key with the groove and
turn in a clockwise direction until it stops. Do not
fasten too tightly!
4) Insert the torch pulse signal connector into the
socket (part 2 of the display);
TIG WELDING:
Before connecting the gas make sure the cylin-
der contains pure Argon gas. Never use any other
type of gas.
Connect the pressure regulator to the cylinder,
after which, connect the latter to the gas tube of
the torch.
TIG welding is usually carried
out with a constant current, with
a negative pole (‘-‘ see fig.3).
The cable of the TIG torch is
then inserted into the negative
socket (17 of fig.1) , whilst the
earth cable of the workpiece is
connected to the positive socket.
(15 of fig.1) .
At this stage it is possible to
adjust the welding current using
the potentiometer (12 of fig. 1)
on the front panel.
7. IGNITION OF THE TIG ARC
After opening the gas by means of the tap on the
torch handle (A), adjust the flow rate using the tap
(B) on the cylinder (around 6 litres/min).
Rest the ceramic of the TIG torch on the workpie-
ce
(step 1 of fig.5) ; bring the tungsten electrode
into contact with the workpiece, then press the tor-
ch trigger, whilst moving in a circular motion where
the ceramic is positioned
(see step 2 of fig.5) .
At this stage, ignite the arc by moving the elec-
trode away from the workpiece a few millimetres
(step 3 of fig.5) .
Weld maintaining the same distance from the weld
pool, whilst keeping the torch trigger held down.
Release the button to interrupt the welding process.
8.POWER CONNECTOR
Before connecting the machine check the
tension, number of phases and the power supply
frequency. The admissible power supply is
indicated on the information plate on the
machine. Check that the earth of the welder has
been connected correctly. Furthermore, make
sure that the plug provided with the equipment is
compatible with the local grid sockets.
Make sure that the power supply provides sufficient
power for the machine to function (tension ranges)
The machine is provided with a specific power
cable that does not usually require an extension
lead; in the event an extension lead is required, use
one of the same capacity or higher than the
machine in use, according to the length of the
cable. A 2.5 mm² three-pole cable + earth, of the
same size or larger.
WELDING
PROCESS
Front socket
+
15 of Fig.1
Front socket
-
17 of Fig.1
TIG EARTH CABLE TORCH CABLE
Fig.3
A
B
Fig.4
Fig.5