A truck body shop up here bought a couple Synchrowave 350's a couple months ago instead of Dynasty's because they liked their previous Syncro 350. I haven't done a lot of TIG and don't know much about the new ceriated and lanthated tungstens but it used to be zirconium tungsten was used on aluminum cause it would handle more heat than pure tungsten. This is of course on a transformer machine.
It looks like your welds might have been just a touch cold by looking at the crater. Maybe adjusting for penetration on the AC balance would make the ripples smoother? It looks like you had lots of cleaning by the different coloration around the welds. If I remember correctly, reverse polarity gives the cleaning action and straight gives the penetration. If you have the AC balance adjusted for more cleaning (DCRP), the tungsten will get too hot too fast. Actually if you switch the machine from AC to DC reverse and strike an arc for a second or two on a piece of copper will clean a lightly contaminated tungsten. You can even use a penny. Learned that from a TIG welder that does a lot of aircraft work and critical stuff.
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