I never had to weld cast iron, but I hear alot of peolple also have good results with sil-bro for tig welding cast iron. I hope that may help some

I have used 3/32 thoriated, ceriated and now 1.5% lanthanated on a 185 power tig everlast. Welding alu the 1.5 lanth came out on top barly rounding at 185 amps the ceriated started to split at 165 and the thoriated came in last welding great at first the spliting after about four sec of welding at 1...