Ac Welding; Alternating Current Waveforms - EWM T5.00-AC/DC Comfort 3.0 Operating Instructions Manual

Table of Contents

5.1.6

AC welding

The welding of aluminium and aluminium alloys is made possible by the periodic change of polarity on the

tungsten electrode.

The negative pole (negative half-wave) of the tungsten electrode determines the penetration characteris-

tics and has a lower electrode load compared to the positive half-wave. The negative half-wave is also

called "cold half-wave".

Whereas the positive polarity, i.e. the positive half-wave, breaks up the oxide layer on the material

surface (the so-called cleaning effect). At the same time, the tungsten electrode tip melts into a ball (the

so-called balled end) due to the high thermal effect of the positive half-wave. The size of the balled end

depends on the length (balance setting > see 5.1.6.3 chapter) and the current amplitude (amplitude ba-

lance > see 5.1.6.4 chapter) of the positive phase. It should be noted that a balled end that is too large

may lead to an unstable and diffuse arc resulting in a low penetration profile. Therefore, the relationship

between the current amplitude and the balance of the task must be adjusted accordingly.

5.1.6.1

Selection

Display

for AC welding machines only.

099-00T500-EW501

30.1.2023

Setting/selection

Alternating current waveforms

------ Rectangular - Highest energy input (ex works)

------ Trapezoidal - An all-rounder, suitable for most applications

------ Sine - Low noise level

Functional characteristics

Figure 5-6

TIG welding

Table of Contents

Do you have a question about the T5.00-AC/DC Comfort 3.0 and is the answer not in the manual?