If by regular steel you mean mild steel ,, mild steel has nothing to add to a blade. It is not meant for the things we want a blade to do. If you mean a carbon steel that is meant for knves and not stainless. I have nto welded that with 440C. Nor would I as the problems mentioned in the above posts would be problems in the billet. Cracks, difficulty in heat treat etc. I believe JPH has welded stainless billets and a few others on here have also. But it is not for the weak of heart or newcomer to the game. If you want to learn knife making get some basic knife making carbon steel and a good book. Also check with the bp on heat treating in the files. Nice steels include 1084, 1095 and 5160. They are easy to work and heat treat is doable at home with a forge.
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