Goo,
It the fires of Toad Hall we confirm the welds when welding the barrel several times , its not a one and done, after the barrel is complete, we proof test the barrel, several times. There are things to look for when one is welding the tubes that show the metal is becoming one solid union and not a unwelded seam, only learned by experience. Good wrought iron is a dream to weld , a good barrel smith can weld poorer quality WI but its work. Angus, Ken Guy, Dan Thompson , JB Bauer and others that have been to Bookie's Barrel welding classes can attest to this.
Tim
P.S. no offense taken with questions about wrought iron or its suitability for barrel welding, or how to weld it up.