Never cut a 'meant to be welded' one off..
but i just cut off my bolt on hard tail..
Seems the guy before me thought the bolts werent enough, so he fired up the propane torch and melted some coat hangers on it for added safety..
At least thats what it looked like to me...
I've seen plenty of "bolt-ons" welded on! However, if it was a weld-on to begin with, why not just pick up another frame? They're cheap enough..OR buy a new, one-piece frame. Cutting off a welded on frame section just to bolt one on doesn't sound good to me. Maybe more of a pain in the ass than anything else..