Ac Welding; Ac Balance (Optimise Cleaning Effect And Penetration Characteristics); Ac Commutation Optimisation - EWM Tetrix AC/DC Smart 2.0 Operating Instructions Manual

Functional characteristics
TIG welding
5.1.3

AC welding

5.1.3.1

AC balance (optimise cleaning effect and penetration characteristics)

To weld aluminium and aluminium alloys, AC welding is used in combination with a continuous change in
polarity of the tungsten electrode. The process encompasses two phases (half-waves): a positive and a
negative one. The positive phase cracks the aluminium oxide layer on the material surface (so called
cleaning effect).
At the same time, tungsten balling occurs at the tip of the tungsten electrode. The size of this balled end
depends on the length of the positive phase. Please note that an excessively big balled end will cause the
arc to become unstable and diffuse, with low penetration. In the negative phase, the tungsten electrode is
cooled and the required penetration is realised. Make sure to select the correct durations (balance) for
positive phase (cleaning effect, balled end size) and negative phase (penetration depth) by setting the AC
balance. The default (zero setting) balance setting is 65%, referring to the duration of the negative half-
wave.
5.1.3.2

AC commutation optimisation

The AC commutation assistance function can help to increase process stability when welding materials
such as pure aluminium. If half-wave failures should occur during the welding process, the parameter can
be increased, counteracting half-wave failures.
The parameter must first be switched on in the machine configuration menu > see 5.6 chapter. The
parameter value can then be selected and set in the Expert menu > see 5.1.11 chapter.
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Figure 5-2
099-00T404-EW501
02.07.2020