The DC power source uses what is known as DC (direct current) in
which the main electrical component known as electrons flowin
only one direction from the negative pole (terminal) to the positive
pole (terminal). In the DC electrical circuit there is an electrical
principle at work which should always be taken into account when
using any DC circuit. With a DC circuit 70% of the energy (heat)
is always on the positive side. This needs to be understood because
it determines what terminal the TIG torch will be connected to (this
rule applies to all the other forms of DC welding as well ).
DC TIG welding is a process in which an arc is struck
between a TUNGSTEN electrode and the metal work
piece. The weld area is shielded by an inert gas flow to
prevent contamination of the tungsten, molten pool and
weld area. When the TIG arc is struck the inert gas is
ionized and superheated changing it’s molecular structure
which converts it into a plasma stream. This plasma
stream flowing between the tungsten and the work piece is the TIG arc and can be as hot as
19,000°C. It is a very pure and concentrated arc which provides the controlled melting of most
metals into a weld pool. TIG welding offers the user the greatest amount of flexibility to weld
the widest range of material and thickness and types. DC TIG welding is also the cleanest weld
with no sparks or spatter.
The intensity of the arc is proportional to
the current that flows from the tungsten.
The welder regulates the welding current
to adjust the power of the arc. Typically
thin material requires a less powerful arc
with less heat to melt the material so less
current (amps) is required, thicker
material requires a more powerful arc with more heat so more current (amps) are necessary to
melt the material.
LIFT ARC IGNITION for TIG (tungsten inert gas) Welding
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