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26
AC Welding
AC (alternating current) enables us to TIG weld non ferrous alloys like Aluminium, Magnesium and Alumin-
ium Alloys. These materials have an insulating surface oxide layer that melts at a higher temperature than

is ideal because the nature of the AC wave form assists in breaking the surface oxide layer.

The reversing of the polarity breaks the surface oxide while the direct polarity melts the base material.
direct polarity
reverse polarity
current

stoppage. These problems typically occur during the transition between + and - cycles.
-

makes the AC arc unstable.

fed into the welding circuit. The HF maintains the arc stability during the half cycle when the electrode is
positive.

area in an ionized state. When the arc is ionized the arc is maintained during the half of the cycle when the

producing an unbalanced wave.
UNBALANCED WAVE FORM
+
_
HF
reverse polarity
 
direct polarity
current
reverse polarity
 
direct polarity
current
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