Welding cast iron to mild steel
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  1. #1
    Join Date
    Oct 2010
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    25

    Welding cast iron to mild steel

    For AC stick welding what is the best rod for welding cast iron gate finials to mild steel? The steel is 3/4 inch square tubular steel 1/8th inch thick. The finial has a 3/4 inch square cavity to accept the steel.

  2. #2
    Join Date
    Feb 2008
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    North of Philly
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    14,788

    Re: Welding cast iron to mild steel

    My supplier recomends 7018 or mig for all his cast parts. Parts are often cast steel rather than true cast iron.
    .



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  3. #3
    Join Date
    Nov 2007
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    2,347

    Re: Welding cast iron to mild steel

    some times i just use mig
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  4. #4
    Join Date
    Oct 2009
    Location
    Austin TX
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    531

    Re: Welding cast iron to mild steel

    Quote Originally Posted by jimrockireland View Post
    For AC stick welding what is the best rod for welding cast iron gate finials to mild steel? The steel is 3/4 inch square tubular steel 1/8th inch thick. The finial has a 3/4 inch square cavity to accept the steel.
    I always use nickle/iron sticks using DC + (positive) when welding my iron finials to the mild steel posts. Seems stronger and never had one crack.
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  5. #5
    Join Date
    Feb 2010
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    upstate ny
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    123

    Re: Welding cast iron to mild steel

    you can use a 18/8 stainless rod too.the alloy content lets it remain pretty stretchy even w/ the high carbon in the cast iron.haz will be brittle with any method
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  6. #6
    Join Date
    Nov 2005
    Location
    Nashville, TN
    Posts
    2,062

    Re: Welding cast iron to mild steel

    glue. or er70s mig wire. I use epoxy. Construction adhesive works too> No need for special filler on something so non critical. If it is cold were you are keep your adhesive warm prior to use.

    On stuff like more critical like casting that might fall off use Nickel rod.

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