If you are thinking of having it TIG or Heli-arc welded, then the simple answer to that is "No".

Here is why:

Compound bow limbs (even the older ones) are made of alloys. It's not just aluminum. It would be impossible to match the filler rod that you intend to use to the base metal. Plus there are a few other factors. Compound bow limbs are cast in a mold to get their shape. Casting is in general a fairly porus composition, meaning lots of air pockets. Welding on cast changes that, plus it hardens the entire area you are welding. So even if you managed to get the base metal to take the filler rod, it would never flex there after it cooled. So basically you would have a limb that would not evenly bend, and would most likely snap right where you welded when you go to string it back.

I'm not sure what other repair could be done at a boat shop that would help you.