Cooling wasn’t really one of my issues, other than trying to contain warpage. My Miller Dynasty 200DX AC TIG and air-cooled torch would not generate the heat needed for proper aluminum welds on my RCR. I had to add supplemental heat with MAP gas torch.Thx for the concern. I will practice on some scrap 3/16 plate with 1/2” plugs and will use a series of tack welds so plenty of time for cooling.