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best way to weld cast iron

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  • Hardrock40
    replied
    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.

    Leave a comment:


  • elvis
    replied
    I know it isn't welding cast iron, but do any of you guys tig braze it with silicone bronze?

    Leave a comment:


  • aametalmaster
    replied
    Depends what the part is. Not really any wrong answers...Bob

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  • old jupiter
    replied
    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) . . . .

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

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  • H80N
    replied
    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

    http://www.lawsonproducts.com/Cronat...8.lp#documents

    Leave a comment:


  • gnforge
    replied
    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.

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  • walker
    replied
    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.

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  • eecervantes83
    replied
    I use fiberglass blankets and bricks. 55 nickle rod works well

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

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  • DPSwelder
    started a topic best way to weld cast iron

    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.
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