75°
75°
This is known as Fusion welding where the
edges of the metal pieces are melted together
using only the heat and arc force generated by
the TIG arc. 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 while fusing the
materials together.
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.
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. 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 oxidised and
contaminating the weld pool.
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.
34
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