PRO-POINT ARC 170 Manuel D'utilisation page 30

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DC TIG welding is a process in which an
arc is struck between a TUNGSTEN
electrode and the metal workpiece. The
weld area is shielded by an inert gas
flow to prevent contamination of the
tungsten, molten pool and weld area
(Fig. 14).
When the TIG arc is struck the inert
gas is ionized and superheated
changing its molecular structure which
converts it into a plasma stream. This
plasma stream flowing between the
tungsten and the workpiece is the TIG
arc and can be as hot as 34,232 °F. 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 (Fig. 15), thicker material
requires a more powerful arc with more
heat so more current (amps) are
necessary to melt the material (Fig. 16).
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ARC 170 DUAL VOLTAGE ARC/TIG WELDER
For technical questions call 1-800-665-8685
V1.0
Fig. 14
Fig. 15
Fig. 16