A friend of mine gave me a broken casting with the idea that I might be able to repair it. I warned him that the chances were low, but I'd give it a shot. Its the blade guide from an old scroll saw. And he actually has two broken parts (both appear to be made of the same stuff). One is an optional jig which he doesn't need and can be used for 'destructive testing'.
The parts are cast, non-magnetic, have a dull gray finish on the outside and a grainy appearance at the break. I touched the part to a grinder (no sparks) and it grinds to a shiny finish. It scratches (with my pocket knife) about as easily as a chunk of 6061 aluminum I've got lying around. So I figure its some alloy of aluminum.
Now for the fun part: How to repair it. I've got a propane torch (for soldering small parts, plumbing, etc) and an oxyacetylene rig. What's the 'best' method for repairing something like this?
I've heard of Alumaweld. Is it worth trying? Any hints or advice?