Was that welded or brazed?
I think I would choose the V-grove and tig welding.
... see below.
However, if it was brazed, then the filler should penetrate into the crack reasonably well. I can't say about the strength of a butt brazed joint.
Originally Posted by
guy153
it should be fine to weld it again as it's 5 or 6mm thick.
It may be 5 or 6mm at the bolt surface, but that dropout has been significantly thinned, so it may be 2 or 3mm at the weld/joint. It may well not need a deep grove for welding,and one may get adequate penetration using welding on both sides and a minimal grove.
If one is brazing, another option would be to cut a plate to fit into the slot and braze it in place, significantly increasing the surface area of the repair.