Quote Originally Posted by Bob La Londe View Post
Your comments about over penetration and stress risers goes along with Pollards (in his book on aluminum boat building) comments on the subject and his insistence that marine welds need to be back chipped and back welded. The problem is neither you nor Pollard address the difficulties of welding the thinner materials common in smaller boats. I had just assumed you back welded that, and couldn't imagine how you got such a huge build.
Bob, for the life of me I still don't know what the heck it is that you are trying to accomplish! Please show some pictures. Are you saying that you are building or repairing thin skinned boats? You know, there is a reason that boats under .100" are riveted and not welded. Imagine a Boeing hull 737 that was welded.