Yeah I just tried some aluminum an there is an increase of sound but not by much. I will search for the thread with the similar problem by wrenchtamer.
So I went back and listened to the videos that Jody posted on welding tips and tricks for the aluminum settings in part 5 and my welder in AC does not sound anything like the video. It kind of sounds like a louder hissing sound is the best way to explain it.
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