Cast iron to mild steel

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Hey guys, new here...wanting to tig weld a cast manifold to some steampipe, wondering what filler rod i would use and any tips or tricks.CheersMilan
Reply:If it was me either nickel or 309 --Gol'
Reply:Originally Posted by Go1lumIf it was me either nickel or 309
Reply:yes you should preheat the cast to about 500*F and slow cool it in kitty litter or sand if you can. --Gol'
Reply:hi nickel is good .  not so for 309 . 309 is for stainless or stainless to steel. it will pull loose very quickly from cast iron. cast has no give. IF there were no chromium in 309 it might work, but , there is - 'bout 19%.[SIZE="5"Yardbird"
Reply:Originally Posted by Roy Hodgeshi nickel is good .  not so for 309 . 309 is for stainless or stainless to steel. it will pull loose very quickly from cast iron. cast has no give. IF there were no chromium in 309 it might work, but , there is - 'bout 19%.
Reply:I would recommend pure nickel though. Carbon is not dissolved in nickel, in fact it is rejected as grafite, that it is positive.But Chromium is strong carbide-maker and therefore fusion zone between cast iron and 309L weld metal will be very brittle (309L contains around 22% Cr).One tip more beside preheating: put nickel on cast iron side first (so called "buttering technique"), and then join nickel with steel.Good luck!
Reply:what about from mild steel to 304 stainless ??
Reply:Originally Posted by RSWEPNwhat about from mild steel to 304 stainless ??
Reply:The primary problem when joining dissimilar metals are the characteristics of the two metals. Primarily the shrink when they are cooling. Nickel alloy rods are used because of the stretch in the nickel. So rigidity is a big concern in this particular process as cast iron has very little stretch (if any) at all. It still requires preheat and post heat as well as peening. The best thing I have found for joining steel to cast iron is Allied's CoreCast 8600 outer shielded flux cored mig wire, even without the shielding gas. I first tried it because of cracking problems when joining mild steel to cast iron. Smaller welds require no peening or pre and post heat. Welds on larger objects should be preheated and post heated. I have used it for repairing antique castings and letting them air cool when slow cooling was not an option.I would suggest reading the info in the following links:http://search.lincolnelectric.com/cs...ined&n=1&la=enhttp://search.lincolnelectric.com/cs...ined&n=2&la=enhttp://search.lincolnelectric.com/cs...ined&n=3&la=enThe difference between art and craft is the quality of the workmanship. I am an artist.
Reply:Oh, it's awfully expensive though. Near $40.00 per pound.The difference between art and craft is the quality of the workmanship. I am an artist.
Reply:Thanks for the replies, what gas and tungsten would i use for the cast to mild steel and what gas and tungsten for mild steel to stainless.Thanks.