The suggestions stated are valid ... basic settings a crucial as well for aluminum set on ACEN with a starting balance around 30% and frequency set around 100 HZ ... No pulse ... proper gas flow and it looked like the aluminum wasn't prepped properly ... remember when you dress down the aluminum do not use abrasive that has been used on any other metal you WILL contaminate it ... and very important make sure the brush you use is SS not ferric steel and ONLY use it on aluminum. As for mild steel ... DCEN and proper prep ... with TIG always remember the three c's and the three p's CLEAN, CLEAN, CLEAN ... PRACTICE, PRACTICE, PRACTICE. It will come together for you just stay with it.
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