Paladin
First advice would be to remove the anodize coating prior to welding.
There are techniques for welding annodized aluminum, but in my opinion those techniques are pretty much limited to thick sections.
If you are doing pans a close fitup in the corners is a must. Both edges touching.. no gap with .035
a piece of angle, or a copper bar clamped flush to the inside can be used as a heat sink so that you can make a nice outside corner weld.
A 1/16th cerium, lanthanum or zirconium electrode would be best.. go ahead and put a blunted point on the tungsten.
Set your Dynasty to about 55% EN for balence control. Maybe set your current to 50 amps to start.. If pedal to the metal does not get you a nice bead than increase in 5 amp incraments. Frequency 200 Hz
If you are not seeing a nice etch at the toes of the weld than reduce EN in 5% incraments.
Remove the annodize with a 1 or 1 1/2" 80 or 120 grit silicon carbide disc in a pnumatic angle die grinder.
Hello Paladin, as usual, Lawrence has included pretty much the complete package for being as successful as one might expect with the situation that you have described. I would only add considering the use of a SS angle, block, or other stainless steel backer, the tighter to the inside surfaces of the corner the better. You are certainly facing a challenge, anodizing will affect surface depth to varying degrees, .035 thickness doesn't leave a lot to work with so be as careful as possible with the dressing portion of your prep. You might also consider bending some lead in tabs to be clamped as close as possible to the start of the weld with the end of these angle tabs contacting the corner of the pan and starting your weld bead on them and then welding from the tab and then onto the corner of the pan this might prevent excessive burn-back on the start of the corner of the actual pan. Just a few more items for your consideration. Best regards, Allan