You can weld it with a mig.What you do is bolt it or tack it to a flat plate after you v it out.As you v it out look at the sparks,if you cant tell a lot of difference between the sparks you see and regular steel that means its cast steel,which you for sure can weld with mig or 7018.Save your money dont buy the cast iron rod or nickel rod.Heat it with a torch to 3 or 400 degrees.Tack it on both ends and weld it with small welds.If its a long crack you might need more tacks.If you use a rod you need to weld it the same way except peen your weld with a chipping hammer.Dont get in a big hurry,but you kind of want it hot as you go.If its a long weld you might want to heat it up a little with the torch before you finish welding it.It could crack,if it does its most likely going to be right next to the weld.If its not too bad grind it out and weld it again.Thats the worst part about it,it might crack.If you get it welded,leave it bolted to the flat surface untill it cools off.Grind off the tacks or unbolt it and it should be allright. I welded the belly pump housing on my H Farmall like that with a mig and then ground and filed the surface flat.It doesnt leak and I have used it on a loader quite a bit.I welded cast like that with 7018 on a Cat loader on the drive wheel and it worked.That time with the 7018 it cracked in a couple of places because I think it was too much stress because of the heat,but it doesnt allways crack then.With a mig it can crack but not as likely.I also welded a long crack in the back housing on the same H tractor with a mig.It took a good 4 hours because it was real thin and overhead.I made a few welds then grind it smooth and look for cracks.About half way it cracked in 2 more places(or it was allready cracked thats when I saw them)I drilled a hole nearly through the cast at the end of all the cracks and finished welding it up.Last I looked it was still holding.That time I also had to grind a bunch of bronze out of it to get the mig to stick.By doing all that grinding I didnt heat it a whole lot with a torch,but I did warm it up a couple of times.You can weld cast with a mig,and it doesnt work too bad.There is cast stuff that you cannot weld with a mig,but so far I havent found any yet.I saw an old Allis Grader that the whole front end was welded on with 7018,and they welded reinforcing plates on with 7018.Dont know who did it or when but it was a long time ago,had 2 different colors of paint on it since then.
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