PRO-POINT ARC 170 Manuel D'utilisation page 33

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TIG WELDING WITH FILLER
WIRE TECHNIQUE
It is necessary in many situations
with TIG welding to add a filler
wire into the weld pool to build up
weld reinforcement and create a
strong weld. Once the arc is
started, the torch tungsten is held
in place until a weld pool is
created, a circular movement of
the tungsten will assist is creating a
weld pool of the desired size. Once
the weld pool is established tilt the
torch at about a 75° angle and
move smoothly and evenly along
the joint (Fig. 22). The filler metal is
introduced to the leading edge of
the weld pool. The filler wire is
usually held at about a 15° angle
and fed into the leading edge of
the molten pool, the arc will melt
the filler wire into the weld pool as
the torch is moved forward. Also a
dabbing technique can be used to
control the amount of filler wire added, the wire is fed into the
molten pool and retracted in a repeating sequence as the torch
is moved slowly and evenly forward (Fig 23). It is important
during the welding to keep the molten end of the filler wire
inside the gas shield as this protects the end of the wire from
being oxidized and contaminating the weld pool.
TUNGSTEN ELECTRODES
Tungsten is a rare metallic element used for manufacturing TIG
welding electrodes. The TIG process relies on tungsten's hardness
and high-temperature resistance to carry the welding current to
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ARC 170 DUAL VOLTAGE ARC/TIG WELDER 8611295
Fig. 22
Fig. 23
33