I cant tell whether your being sarcastic or not, so if you are, ignore this.
Do you have any idea how huge a fire he would need to do that? Not to mention a gigantic hammer to make the weld, and some way of lifting both the anvil and face, most people dont really have tongs(or arms) capable of doing that....
Dodge, I would reccomend hardfacing it, with one layer of softer hardface, then a layer of harder. first layer 40-50, then the second should be 50-55. If you dent it this way, you can always patch it up with the same hardfacing rod.
I dont know if your doing this on your own, or you have already found this guide, but here is someone who did the same type of thing: http://www.metalwebnews.com/howto/anvil1/anvil2.html