Unimig RAZOR 320 AC/DC, Operating Manual

Page: 20 / 48

36
Razor
32OAC/DC TIG-MMA
AC Square Wave:
Allows the current to change from ele positive to electrode - negative
very quickly. This produces high voltage as the current switches polarities allowing the arc to re-
start easily. The arc can be maintained without the use of high-frequency and the fast transitions
provide for responsive, dynamic and focused arc for better directional control.
AC Triangle Wave: Characterised by a particularly soft and concentrated arc
combining the ef-
fect of peak amperage while reducing overall heat input. Leads to quick puddle formation and,
because of lowered heat input, reduced weld distortion, especially on thin material
This wave
form is ideal for very precise welding of thin Aluminum plate.
AC Sine Wave: It is the standard Wave form, characterised by low noise and excellent arc
control, it also gives the soft-arc feel of a conventional power source, while using square transi-
tions to eliminate the need for continuous HF.
AC WAVE FORMS
AC TIG Welding - AC Wave Forms
Current
Increasing Square Wave Frequency
It is possible with the RAZOR320ACDC machine to adjust the frequency of the AC Square Wave output. It means that the
amount of time that it takes the AC square wave to complete a full cycle switch from postive (+) to negative (-) can be ad-
justed from 20Hz (20 times per second) to 200Hz
Increasing frequency (Hz) causes the current to change direction more often, which means that it spends less time per cycle
in both DC electrode negative and DC electrode positive mode. By spending less time at each polarity, the arc cone has less
time to expand.
A higher frequency produces a narrower arc cone producing an arc that is tighter with more focus at the exact spot the
electrode is pointing. The result is improved arc stability, ideal for fillet welds and other fit ups requiring precise penetration.
Decreasing the frequency softens the arc and broadens the weld pool producing a wider bead, produces good overall pen-
etration and ideal for build up applications.
Slower AC Square Wave Hz
Wider Arc
Broader Weld Pool
Wider Weld Bead
Wider Cleaning
Action
Faster AC Square Wave Hz
Narrow Arc
Narrower Weld Pool
Narrower Weld Bead
Faster Weld Speed
Narrower Cleaning
Action
Current
Current
Slower AC Square Wave Hz
Faster AC Square Wave Hz
AC Square Wave Hz
AC WAVE FORM FREQUENCY CONTROL
TIG WELDING GUIDE
20