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Due to these inherent characteristics in the TIG welding process the welding process to be carried out
must satisfy certain exact specifications. TIG welders are designed and constructed in accordance
with these specifications. Correct installation, use and maintenance will result in a long, satisfactory
service, providing clean and proper welding.
The TIG torch is connected directly to the outlet of the welding machine and the manual gas control is
induced in the torch. Starting is facilitated by the characteristics of the generator.
The starting of the arc is often obtained through the use of a high frequency (HF) device which gener-
ates high voltage impulses (kV), however "high frequency" is not anticipated in scratch ignition but a
momentary short-circuit situation; at the moment that the electrode is raised, the arc is produced and
the current is transferred to the previously established value.
TIG WELDING SCHEME (Fig.3)
1 - Respect the previously detailed indications on preparation and installation.
2 - Connect the earth cable to the positive terminal + of the welding machine.
3 - Connect the torch to the negative terminal – of the welding machine.
4 - Connect the argon gas cylinder to the device on the TIG torch.
5 - Carry out welding, regulating the intensity using the potentiometer.
PROTECTION GAS FOR TIG WELDING
The protection gas normally used is pure argon of variable quantity in accordance with the current
used (4-8 l/min).
The TIG welding procedure is suitable for welding steel (both carbon and alloys), and allows a welding
with a top quality appearance, it is often used for a primary weld on tubes.
You must carry out detailed preparation and clean all edges before each weld.
CHOICE OF ELECTRODES FOR TIG WELDING
The electrodes normally used are made of tungsten with Thorium (red colour). As a general guide we
have provided a table with the diameters and the corresponding intensities.
PREPARATION OF ELECTRODES FOR TIG WELDING
Special attention is needed in the preparation of the point of the electrode, as indicated in the following
diagram.
The table below indicates recommended values for the angle of variation with the welding current.
SOLTER
SOLDADURA S.L.
Electrode (mm)
1,6
2
2,4
Angle ( )
30
60-90
90-120
INVERTER
Welding Current (A)
5-35
30-100
100-160
Welding Current (A)
5-30
30-120
120-160
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