Some types of rods are AC. or DC. only. I am a bit rusty on stick welding but I think that DC. reverse polarity for welding over head and out of position with 5 P rod was the best way. I thought that it penitrated rust and paint better and that DC. the welds are cleaner with less splatter and you have better arc control and start. Lastly I think that DC. straight polarity welds thinner stock better. The down side is stick machines and tig machines that do both AC/DC are almost always twice as much money. The good thing about AC. only machines they are almost imposible to kill.
Last edited by Dave M; 05-14-2008 at 10:11 AM.
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