I'd love to weld that kinda thing lol.
I've been at Hobart for two days... Last night we learned about backwelding, where you gouge out the back side of a weld and re-weld it from that side on purpose.
Our teacher said the last time he did it in the field was on a 2" thick boiler shell.
We don't do it at Hobart, but Im tempted to get some 1" plate from the steel yard and try it myself!
I still don't understand why one would do that instead of welding it open root, or in a double bevel configuration, but still...
That was pretty cool to see. Wonder how many pounds of electrode it takes? :)