irom water pipe

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Went to scrap yard today and bought a section of pipe to make a fire box for a smoker and after I got it home and started cutting with plasma cutter realized its water line pipe with a very thin layer of concrete inside it..My buddy says its ductile iron pipe and will be a pain in the butt to weld... for a fire box to be welded to 3/16 in. mild steel is it possible to weld this with 1/8 in. 7018 rod and not have it crack and fall off cookerDon't really have a way to preheat it to any high heat either if needed...
Reply:Better of finding steel pipe. Sent from my iPhone using TapatalkLong after the price is forgotten, the quality will remain.Both of my Poppy's 1954 Short Hoods -Third generation to weld with it and teaching a fourthSA 2## - Bought and sold more than I can remember or care to list, 8 in the shop right now
Reply:Yup, if that is what your buddie says it is... It won't weld. Period.  Had a client some years back that bought a bunch of that stuff for an irrigation project (with groovelock ends) I told him take it back to wherever he found it, he just couldn't wrap his head around the fact that his "buy of the century" couldn't be used like steel pipe.
Reply:he hasn't seen it he said he just thought that's what it was. any chance it might just be mild steel pipe or do they not use that as water line? Well that really blows if it is ductile iron just wasted money for it no taking it back..Last edited by dbowling; 03-25-2016 at 10:18 PM.
Reply:well it wont hold a weld so its ductile iron, welded a piece of mild steel to it and it could be nocked loose just tapping it with chipping hammer..so ended up cutting a 20 in. diameter pressure tank 1/4 in. thick steel and using it for the firebox..
Reply:They do make steel pipe concrete lined. I had to so a fire line in it at the plant I'm working at. Was speced for it. Had to order the pipe and fittings from Bakersfield and shipped up to the Bay Area. Heavy as hell and diffinetly not ductil iron. Put that stuff in daily.