10
To select this welding mode :
turn switch 10, select TIG and press
confirm.
Inert gas welding with an infusible Tungsten
electrode (TIG: Tungsten Inert Gas) for short, is a
welding procedure whereby the heat is produced
by an arc that strikes between a tungsten electrode
(which is not consumable) and the workpiece. The
welding is carried out by fusing the edges of the
workpiece or by adding other filler material using
specific types of rod to create a joint. The torch is
ignited by touching the workpiece with the electrode
and then lifting.
The TIG procedure can be adapted to any work
position and can also be applied to very thin sheets
of metal (0,2-0,3 mm). The TIG procedure is
distinguished by the ease with which the arc can
be controlled, a powerful and concentrated thermal
source and the simple manner in which the filler
material can be controlled. 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 9 in fig. 1, for
example, regulates the welding current.
The correct connection of the torch and earth cable
is shown in the following table:
7.1 PULSED TIG WELDING
Pulsed TIG welding is used to reduce the heat
input to the workpiece, allowing excellent welding
results to be obtained even on very thin sheets.
This type of welding is very useful when using fill-
ing materials, or to produce highly aesthetic weld
beads.
The current can also be adjusted, bringing it from a
very high peak down to a very low peak. These
peaks are modulated with frequency set by the
operator, which can go from a few Hertz up to sev-
eral hundred or in some cases a thousand.
7.2 TIG WELDING (Lift-Arc)
By turning switch 10 it is possible to choose from
the different TIG welding modes; press the switch
to select the desired option.
Select this option and the welding screen will
appear:
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