On Thu, 29 Nov 2007 19:18:59 -0600, Brian Whatcott
wrote:

Uh-oh: you said "aluminum boat" and "MIG welder" really, really,
casually.
Tell me you have MIG welded aluminum before - that you have the right
mask screen, that you can not only stitch thick aluminum castings
together, but you have seamed sheet as well....

Place I do my boating has lots of fifty year old aluminum boats, none
of which have ever had paint or maintainance of any kind. All are
riveted. Grumman canoes are riveted and they get bounced off the rocks
regularly, if they are used in white water. I don't think welding is
really suitable for anything under forty feet. Metal is too thin. Note
that all those airliners are riveted.

Casady