A well done brazed joining should be every bit as good as a welded one, note the "well done" reference. MIG is not often used by frame builders, TIG is the vastly more common welding method. If you must use MIG do a few practice joinings on scrap and test after.


But my greater concerns are about the forks' ability to handle the very different force load paths and that the forks are likely not designed with this in mind. If you're doing this for yourself then all is good as long as you understand the possibility for fork bending under hard braking. But if you're considering doing this for any one else I would strongly suggest that you don't. Andy.