Ac Welding; Ac Balance (Optimise Cleaning Effect And Penetration Characteristics); Alternating Current Waveforms - EWM T4.06-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

Alternating current waveforms

Selection
Display
16
Setting/selection
Alternating current waveforms
------ Rectangular - Highest energy input (ex works)
------ Trapezoidal - An all-rounder, suitable for most applications
------ Sine - Low noise level
Figure 5-2
Figure 5-3
1
EXIT
4s
099-00T406-EW501
14.07.2020