I started a new job back in February, and I use a Dynasty 350. I weld mosty stainless, but I get quite a bit of aluminum as well, and I have been having trouble getting heavier aluminum to weld decently. (I weld alot of 1/2" aluminum, and some thicker.) I have been experimenting with settings quite a bit, but I would really appreciate some knowledgeable guidance.

I have a question about AC current settings for TIG welding aluminum when using an advanced power source like the Dynasty 350. I am not quite sure how to word this, but what is the difference between increasing the balance control (for more penetration and less cleaning) and changing the ratio of EP and EN current (increasing the EN and decreasing the EP, for more penetration and less cleaning)? I undertand that the differential current control affects the actual amperage each of "side" of the AC wave, and that the balance controls the proportion of time that the arc spends on each side regardless of current the current setting. But do these two approaches simply achieve the same thing in different ways, or is there a difference in the arc? I hope that question makes sense.

It seems to me that achieving the more penetration/less cleaning condition by turning up the EN and/or dropping the EP gives more of a sharp, biting, and harsh arc, while leaving the EP a little higher and turning the balance up gives a focused but smoother arc with a more fluid puddle, maybe? Has anyone else made observations like this? (My observations may not be very accurate because I have the bad habit of trying to make too many adjustments at once.)

I have been trying to get the most heat I can out of the machine for welding thick aluminum, and I tend to dislike the arc characteristics I get when I have the settings really cranked up. (I am sure there are some technique issues involved as well.)

I would appreciate any info, observations, or advice anyone might have on this. Thanks much!


-mjc