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TIG WELDING FUSION TECHNIQUE:
Some welds combining thin materials can be accomplished
without filler metal like edge, corner, and butt joints. This is
known as Fusion welding, where the edges are melted together
using only the heat and arc force. Once the arc is started, the torch
is held in place until a weld pool is created, a circular movement of
the tungsten will assist in creating a weld pool. Once the pool is
established tilt the torch at about a 75° and move smoothly, evenly
along the joint while fusing the materials together.
Weld pool
TIG WELDING WITH FILLER WIRE TECHNIQUE
A filler rod is added to the weld pool to build up reinforcement
and create a strong weld. The filler metal is introduced to the
leading edge of the weld pool formed by fusion. The rod is usually
held at 15°, the arc will melt the filler 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.
Weld pool
°
75
75°
Shield gas
IBL T220-105 | 250-106
14
Filler Rod
15°
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