Anvil welding, cameron, originally I think you said they knew all about it. Then they/you want to know what kind of rod to use?
99.9% of anvils folks THINK need repairing do not. Cosmetic damage, a slight sway. . . are all part of old anvils. It makes them no less useful and the “repairs” will not make one’s work better. Anvils ARE NOT a precision flat for measuring, reference or honing. They are a WORK surface for forging. A slight sway is actually beneficial, corners on most anvils are way too sharp and dressing the chips to round usually get the anvil to the shape it SHOULD have been. Most of what is wrong with most anvils can be fixed with light grinding or even filing. Did the welding shop quote grinding down the mess they make? It is common practice that weld shops weld and machine shops dress the repaired surface. Grinding by hand can take many hours and if the surface is soft enough to machine with anything less than a BIG industrial mill using expensive carbide cutters then the repair isn’t hard enough. . . I have a couple good anvils with some minor dings. But I also have a several very old anvils wit