MK Welding Multi-GMAW 200 DP PFC - Tig Welding Fusion Technique

OPERATION
36
EN
§4.2.3 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
gas flow
tungsten
off
Lay the nozzle on the
job without the
tungsten touching the
work.
Rock the torch
sideways so that the
tungsten touches the
work & hold
momentarily.
tungsten
touches the
work
Rock the torch back
in the opposite
direction, the arc will
ignite as the
tungsten lifts off the
work.
arc
ignition
Lift the torch to
maintain the
arc.
establishe
d TIG arc