The Electrode Positive part of the AC arc is what breaks up the aluminum oxide layer on aluminum and allows the puddle to be clean and flow out well.
so let that cleaning action work for you before puddling dirty aluminum.
In other words...Dont puddle too quickly
In Brad Goodman's video on full penetration aluminum he used a Miller Dynasty that has all the features like waveforms and amplitude settings.
A member commented that he would like to see a similar video using a much simpler machine like the CK MT200.
I used a #5 clear cup (they film better) with...