Fronius MagicWave 190 Operating Instructions Manual page 90

Effect of the AC frequency on the waveshape:
I (A)
+
-
AC current offset
-70 to +70%
Factory setting: 0%
+70%
wide arc with shallow heat input
-70%
narrow arc, deep heat input, higher welding speed
Effect of the AC current offset on the waveshape:
I (A)
+
-
* Factory setting: 0 (corresponds to a 10% shift to negative)
Positive half-wave waveform
Hard rectangle / Soft rectangle / Triangle / Sine
Factory setting: Sine
Hard rectangle
pure rectangular waveform (stable but loud arc)
Soft rectangle
rectangular waveform with decreased edge steepness, for noise reduction compared to
the pure rectangular waveform
Triangle
triangular waveform
Sine
Sinusoidal waveform (default low-noise arc setting)
90
60 Hz 120 Hz
*
0 +70%
t (s)
t (s)
-70%