Do you know what code you are testing to?
The reason I ask is because in D1.1, when you pass 4g, you get 2g with it.
A 3g using FCAW with no backer is no easy task. Hopefully you're using the 1" coupon.
The root opening and root face should be pre-determined by the code.
Always remember with FCAW to keep it moving. Don't go too slow.
well, i will put it like this. if your a good welder, those tests should be a walk in the park. put abour 1/8" gap so your bead will burn through the back and will be easier to clean and back weld. we dont test 2G down here, usually if you can weld overhead they give the horoz. to ya as a gift haha. as far as the stringer just run ya beads and usually a 3 pass cap (weld reinforcment) should get you through just fine. then again it all depends on the inspector giving the test, and how he wants it to look.