There is a Tig rod for cast iron that has been on the market for many years, I got a couple of samples, but have never used it as yet as I only tigged Alum, SS, Magnesium and one large Brass Bell from a Steam Locomotive.
As far as wire for Cast iron, a nickel wire for cast iron has also been on the market for many years. Nickel or SS on cast was a last resort for me to use and only when someone had daubed a bunch of nickel on something to start with. Cast rod or Bronze with the oxy/acet torch was my choice for repairing Cast. They say you can't repair Nodular Cast, but any old time shopman has repaired it many times by brazing.
The shopmans nightmare is when a Rockmont or other high priced rod salesman comes around and peddles Super Missile weld to the farmers at $30 + a pound and tells them it will weld anything. 309 SS rod is basically the same thing for a lot less money. The repair price just almost doubles after someone daubs it full of missile gunk.
As far as Arc Blow with DC, there are several simple proceduress that can eliminate the Arc Blow when using DC and you can get it when doing any DC welding.
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Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
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