can i weld cast iron with flux core mig?

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just wondering if this will work.
Reply:I doubt it very much.  To weld cast you need to preheat the area around where the weld is going to be and then lay down a pretty hot weld.  I may be wrong but someone with a little more experience may be able to give you a better answer.Neil
Reply:Really depends on what you are doing.  I have done lots of casting on hand rails. I also have mounted shoes on newell post with flux core.  I usually peen (with chipping hammer) the welds on the shoes while it is red hot till it cools.I wouldn't depend on it for things that are critical.  Proper preparation is most important regardless of filler used.  I usually use cast rod for more critical stuff.  Fourney makes a cheap rod "Nomacast" it is non machinable (i guess that means don't grind).  There are also high Nickel rod available for subtantially more.  The high Nickel rod makes has a pretty color and appear to resist rust.  I used to braze antique stuff.
Reply:A guy on the following website has tried it.www.mig-welding.co.ukI'm a member there. it's free to sign up so might be worth a look. All sorts of stuff on there that helped me. Some pros helping out the amateurs (me).Gimme a shout if you join up. I'm Davie there
Reply:Besides all the standard precautions and practices for welding to casts, more importantly there are the filler characteristics to consider, not so much the process. Most fillers that get recommended for use on cast are higher in nickle (nichol). Without looking it up I would say that your most common flux cores have very little to no Ni. Not that they don't make one that will fit the bill, just saying that what most of us grab off the shelf isn't the number one choice. I would  guess that you likely use an e71t-11 or e71t-gs. Both of those have a slightly higher amount of manganese than the average solid wire, the e71t-gs being the worst/most. Manganese tends to work harden and in high deposition %'s will in itself be more brittle than normally desirable.  That is why for many of the average brands of flux cores, especially the -GS they recommend single pass only. Please note that in lincolns 211MP the MP stands for Multi-pass. Even then some thought must be given as to how you are going to perform the weld in order to get maximum dilution.
Reply:HTP America (link at top of page) sells a mig wire for weld cast iron.SandyThanks for the correct spelling of Nickle, I usually can don't remember el or le.  Perhap with that phonetic spelling I can remember it.