LOKERMANN GRAND TIG 200 DC PFC MV, Руководство пользователя

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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 work piece.
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
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 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.