aluminum welding

This weekend I'm renting a aluminum welding unit that will connect to my
ranger8 welder, what I need to know is - do I use ac current or will dc
straigh/reverse polarity be better?
It has been such a long time since I have welded aluminum with a 1lb spool
gun so I can't remember how to set up the machine. Any help will be
appreciated
Thanks
Gary
Reply to
onsite welding
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DC for aluminum MIG. AC for aluminum TIG.
Gary
Reply to
Gary Coffman
some have posted that using MIG dc on Al requires DCRP. is that the case ??
Reply to
Kryptoknight
DCEP... verified here:
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What Polarity Setting is Needed? All MIG welding, including on aluminum materials, requires electrode positive polarity, while flux-cored processes typically use electrode negative. If you are switching your wire feed welder between processes, make sure to switch your polarity. This is a common mistake that many beginning welders make.
Reply to
Zorro

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