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cast iron = nickel base stick rod or heli-arc with nickel base wire cast steel = 7018 stick rod

That looks to be to cold on your settings

Looks good to me

We always used the tri-mix on stainless only, according to our procedures, co2 on carbon was the norm for some industries but our procedure called for 75/25 for carbon.. I don't know if you were asking a question or just making a statement.