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best way to weld cast iron

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  • best way to weld cast iron

    Hey guys I was wondering what the best way to weld cast iron is I normally just braze it.

  • #2
    preheat, weld with ni-rod, and a slow post heat. kitty litter, or floor dry around the part works well to retain the heat


    • #3
      I use fiberglass blankets and bricks. 55 nickle rod works well
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      • #4
        I have used plenty of nickel rod and it works good. I have also used the Crown Alloys 44-30 MIG wire for cast iron with good success. It is expensive, but is an easy solution for most cast repairs. I have not had great luck with either on cast iron exhaust manifolds, as they seem to get burned out over time, and don't like to weld well.


        • #5
          best way to weld cast iron

          Also plain fiberglass the old pink stuff you put between studs. Pull off the paper backing and wrap.
          Very cheap, works great, no mess.
          I will sometimes wrap part in fiberglass then wrap in welding blanket. Stays hot for a long time and saves your blanket when part is very hot. Also use this when welding 4130 alloy parts for slow cooling.


          • #6
            I don't do a lot of cast iron these days... but when I do...

            I have had pretty good luck with
            Cronatron™ 211 Cast Iron MIG Welding Wire

            using 98-2 Argon/Oxy gas


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            • #7
              WOW at $132 per pound, I hope you would have good luck with it.


              • #8
                When I can (smaller parts), and have a good idea what kind of iron it is, AND have cleaned it as best I can (hot vapor degreasing is good if you know a place that does it), I vee out the crack with a rotary file (grinding is said to smear the carbon). I get it heat-soaked up to the desired temperature, with firebrick and asbestos cloth around it to keep it at the right heat, then gas-weld it with cast iron rod, and very slowly cool it. Use cast iron flux; feed the rod into the mushy puddle with a sort of jabbing action that tends to shove the impurities out of the puddle. Kind of a fun change of pace thing to do, and seems to work out well.

                I hear there's a guy around here that repair-welds cast iron cylinder heads by gas-welding. Some time I'd like to go watch him work (just out of curiousity. not as anything I'd want to do regularly) . . . .


                • #9
                  Depends what the part is. Not really any wrong answers...Bob
                  Bob Wright


                  • #10
                    I know it isn't welding cast iron, but do any of you guys tig braze it with silicone bronze?
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                    • #11
                      Originally posted by elvis View Post
                      I know it isn't welding cast iron, but do any of you guys tig braze it with silicone bronze?
                      I think silicone bronze with tig is the cats meow. I have used it on an old, I do mean old wood stove door to replace a broken out section and a hinge.

                      Old cast iron bed frame and several other odd and hard to repair projects.

                      An engine block or cast manifold I have never tried it on those, but I would.

                      IMO its quick and easy.