Functional characteristics
Welding programs
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5.2.3.6 AC commutation optimisation
With AC welding, a periodic change between positive and negative half-wave takes place. This pole
change is called commutation. External influences such as low-alloy aluminium materials (such as Al
99.5) or gases that are difficult to ionize (Ar/He mixtures) may compromise the commutation and lead to
lower arc stability and higher noise levels.
The power source has intelligent commutation optimization that is divided into automatic operation (left
stop) and manual operation (1
‑
100):
• Automatic mode (factory setting)
The commutation optimisation is set to “Auto” as standard. The power source can therefore evaluate
the commutation and automatically ensures the highest possible arc stability, safe penetration and
oxide-free seams for every welding task. Automatic mode is the preferred choice for almost every ap-
plication.
• Manual mode (1-100):
If the result in automatic mode is not satisfactory in rare cases, the commutation optimisation can be
adjusted in manual mode. In this case, the following schematic representation can be used as a set-
ting aid.
Figure 5-13
5.2.4 Arc ignition
The type of ignition (parameter
) can be set in the system menu (push-button ). The HF intensity
(parameter
) can be adjusted in the machine configuration menu if necessary
> see 5.11 chapter
.
5.2.4.1 HF ignition
Figure 5-14
The arc is started without contact using high-voltage ignition pulses:
a) Position the welding torch in the welding position above the workpiece (distance between the
electrode tip and the workpiece approx. 2-3 mm).
b) Press the torch trigger (high-voltage ignition pulses start the arc).
c) Depending on the selected operating mode, the welding current flows with the set start or main cur-
rent.
Ending the welding process: Release the torch trigger or press and release depending on the selected
operating mode.
