BTW, I did some blacksmith work at a commercial place a while back. The anvil that I had to work on there was in rough shape, with big chunks missing. I filled them with 70s-6 mig wire and it worked fine as well. Don't over think this too much, it is essentially a big chunk of metal to hit other lesser chunks of metal on. Just make sure that whatever chunk of metal you weld on for a heel has been veed out so that you get 100% fusion, then fill weld with stringers of 7018. Even if you just lay on the 7018 and grind flat it will work harden on its own over time.
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