I build a lot of tanks. I'm 65 years old and don't have the hand I once did. I've built a trough that has a slot cut out of the lower corner that gives about 3/8" clearance to the top and side of a tank exposing 24" of corner to corner weld area. It has a piece of UHMW pipe slotted and clipped over the outboard edge for the gun to slide on. With my "hog trough", I can make a beautiful weld 20" long on .190 in no time, spraying.

hmmmmm

Spray? Hmmm. We could have quite a discussion about 'spray' but lets say I generally prefer something that may have a little good old short-arc in there. Look at spray arc aluminum under the microscope and one sees aluminum foam. Short arc bigger bubbles and more berries but I'm not sure one is better over the other strength wise. Not arguing here but more to the point of the way I do it and what works for me. The point is 'spray' has no magic for me. One does not repair a canoe with mig by 'spraying', for example.

does the nurse know you are out and about? sorry, I've got to go to work. i'm sure the boys on the trawler will appreciate your invention. lol