PRO-POINT 9085986 Mode D'emploi page 29

V1.0
5. Now rotate the gas cup in the
reverse direction to lift the
tungsten electrode from the
workpiece to create the arc (Fig. 16
and 17).
TIG WELDING FUSION
TECHNIQUE
Manual TIG welding is often considered the
most difficult of all the welding processes.
Because the welder must maintain a short arc
length, great care and skill are required to
prevent contact between the electrode and
the workpiece. Similar to Oxygen Acetylene
torch welding, TIG welding normally requires
two hands and in most instances requires the
welder to manually feed a filler wire into the
weld pool with one hand while manipulating
the welding torch in the other. However,
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 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 (Fig. 18).
TIG WELDING WITH FILLER WIRE TECHNIQUE
It is necessary in many
situations with TIG welding to
add a filler w ire into the
weld pool to build up weld
reinforcement and create a
strong weld. Once the arc is
started, the torch tungsten is
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AC/DC Inverter TIG/Arc Welder
Fig. 16
9085986
Fig. 17
Fig. 18
Fig. 19
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