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Depending what you are going to weld, it's application, what kind of cast steel, will determine how it's welded. You can stick weld it, braze weld it, and even TIG it, but not with mild steel filler.
Let us know what it is, and maybe give us a picture and we'll help you out.
It is not structural in any way. I need to weld some ornamental cast steel to an arbor that I am making. I knew that I could braze it, but I wondered since it was cast steel and not cast iron if it would be possible to MIG weld it.
Not much of an expert on cast steel, but if it's ornamental, long as it is not too big, break, and fall on someone, hurting them, I can't see why not...I repaired my friend's kids moped...cast aluminum...bolt holes from the engine cover, broke up after he crashed it on the road, die grinder to open it up so I could reach the bottom of the holes, then filled them up with tig then re-tapped them.
Cast steel? If it looks good, and not made in China, I'd try it......(Honestly, I did some kind of small project last year with cast steel...nothing structual or anything like that, I forget what it was) but mig came out fine....Do you have some scrap to practice with???
I second that, any mild steel electrode will work.....or some 11018......I always weld cast steel bucket adaptors/shanks with either 7018, er70s6 or e71.....iron finnials for decoration are the same.....Dave