AOTAI Dura ARC160, Инструкция по эксплуатации

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TIG Welding Fusion Technique
Fig. 6-1-9: TIG arc
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.
TIG Welding with Filler Wire Technique
Fig. 6-1-13: Add TIG
filler wire
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.The filler metal is introduced to the leading
edge of the weld pool. The filler wire is usually held at about a 15°
angle
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Fig. 6-1-10: Form a weld pool Fig. 6-1-11: Angle torch Fig. 6-1-12: Torch move
Travel direction
Form a molten pool
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.
Angle torch
75
Angle torch
75
Move the torch slowly and evenly forward
Travel direction
Form a molten pool Add TIG filler wire
Fig. 6-1-14: Form a weld pool Fig. 6-1-15: Angle torch Fig. 6-1-16: Add TIG filler wire
Gas flow
Fig. 6-1-5: Tungsten off the work Fig. 6-1-6: Tungsten touches the work Fig. 6-1-7: Arc ignition Fig. 6-1-8: Established TIG Arc