I think that with 15 minutes of practice on some similar gauge sheet metal, just anyone except a total klutz could O/A weld that crack up without blowing holes. When I first started, my dad kept telling me "add more heat". I still find myself not getting full penetration with O/A at times.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.