On Sun, 9 Dec 2007 19:16:34 -0700, "Bob La Londe"
wrote:

....
Uh-oh: you said "aluminum boat" and "MIG welder" really, really,
casually.


... I'm looking at a Hobart Ironman 250. I already got one of
those cheap ones.....
3rd - Use a clean stainless brush on all surfaces just before welding to
break up and remove the oxidation. Never use your brushes for aluminum on
ANYTHING else. Brushes are cheap insurance. USE THEM EVERYTIME even if you
brushed it yesterday.

4th - A spool gun is the way to go, but even with a push feed gun its
possible to push aluminum if you swap out the V groove feed wheel for a U
groove feed wheel....

5th - There is no 5th item

Bob La Londe

This seems like a plan to me: the story I hear quite often is that
the hot puddle will drop out given half a chance on thin stock.

A particular optical filter is said to be a big help in visualizing
the puddle's state.

Good luck!

Brian W