For my first attempt at brazing I brazed a canti stud to an old chain stay, and then I tried to remove it with a large hammer, the chain stay ended up a mangled mess and the canti stud was never failed in any way at all.

Also, brass can be built up to a fairly large fillet, or it can be be a very small fillet, how much brass is used will affect the strength. For my canti stud destructive testing the fillet was actually pretty minimal.