Originally Posted by
Impulse666
edit: cost: if you get a bike shop to repair it, it'll be loads, but if you go to a small fabricator or auto shop they can do it in a couple minutes.
Not a good idea. Aluminum bike frames are made from 6061 T6 aluminum or 7005 T2. The T6 and T2 are the issue. After welding you will have lost the heat treatment. I doubt a small fabricator or auto shop will have the facilities to restore that.