If what you have is a Smith Anthony Hub Oak stove I would assume your talking about the ash pan door hinges which are cast in as part of the stove?
If so the stove is cast iron and it takes some pretty sophisticated welding to get it done correctly. Not everyone has the expertise to successfully weld/braze cast iron.
You may find it easier to hire someone to fabricate a piece to bolt into the stove body to replace the cast hinge lugs on the stove body. This is assuming that what your talking about is the lugs on the stove body and not on the ash door itself.
I have little to no experience with cast iron welding except to know enough to stay away from it.
If you can upload a photo of the offending area more might be able to chime in with some ideas. Otherwise we are just shooting in the dark, literally.