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Thread: TIG welding cast iron

  1. #1
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    TIG welding cast iron

    I'd like to attempt a small TIG welding project - welding cast iron to steel.


    What TIG settings would you recommend?


    What type of filler rod is best?


    thanks a bunch

  2. #2
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    Re: TIG welding cast iron

    I would per heat parts before welding around 500° to 800°F.
    I use a torch for my cast iron work as do not have tig anymore.

    Dave

    Quote Originally Posted by lpm View Post
    I'd like to attempt a small TIG welding project - welding cast iron to steel.


    What TIG settings would you recommend?


    What type of filler rod is best?


    thanks a bunch

  3. #3
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    Re: TIG welding cast iron

    I use EZ Weld Tig wire which has never failed me yet, especially on some irreplaceable expensive parts. Follow the instructions and keep the part cool.

    https://ezweldtigwire.com/
    Weld like a "WELDOR", not a wel-"DERR"
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  5. #4
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    TIG welding cast iron

    I hear aluminum bronze works good.


    Sent from my iPhone using Tapatalk

  6. #5
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    Re: TIG welding cast iron

    Do you mean Silcone bronze?
    Quote Originally Posted by ljmelius View Post
    I hear aluminum bronze works good.


    Sent from my iPhone using Tapatalk
    It seemed like a good idea at the time!

  7. #6
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    TIG welding cast iron

    Quote Originally Posted by welding1 View Post
    Do you mean Silcone bronze?
    Do you mean silicon bronze?

    Silicone is a synthetic elastomer. Silicon is an element.

    But more pertinently, why is silicon bronze better than aluminum bronze for cast iron?
    Last edited by jwmelvin; 05-08-2021 at 12:39 PM.

  8. #7
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    Re: TIG welding cast iron

    Most old cast iron is only Tensile strength: 25,000 psi.
    Brass brazing rod is Tensile strength: 65,000 PSI
    Brassing rod lower cost than silicon brazing rod

    Dave

    Quote Originally Posted by jwmelvin View Post
    Do you mean silicon bronze?

    Silicone is a synthetic elastomer. Silicon is an element.

    But more pertinently, why is silicon bronze better than aluminum bronze for cast iron?

  9. #8
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    Re: TIG welding cast iron

    Quote Originally Posted by welding1 View Post
    Do you mean Silcone bronze?
    Nope





    Jody does a good job explaining why he chose al bronze over silicon bronze.


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  10. #9
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    Re: TIG welding cast iron

    If you also want to know the procedure. I am sharing a link about welding cast iron here. Hopefully it would be helpful.


  11. #10
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    Re: TIG welding cast iron

    Lots of questions....is it mild steel? How thick are the pieces you want to join, what sort of joint configuration and how critical are these welds (any load on them)?

    I have had zero success with the EZ Weld stuff for some reason, but I know others have had good luck. Brazing with either silicon bronze or aluminum bronze is a good option as suggested. I've had very good luck using Inconel filler rod to join cast iron and ductile iron to mild steel....but the rod isn't cheap. It's mostly nickel, so it's similar to using a nickel stick welding rod for cast iron. I actually keep an eye on eBay for old Inconel filler rod that's new old stock or just old. Often Inconel is being used on jobs with a defined process and they require documentation on the various components, so nobody is going to use an old batch of rods....and it winds up selling pretty cheap. The last tube I got was 8lbs and I paid $30 for it...not too painful.

    One thing I've found that works really well is to use a carbide bit in a die grinder to get the cast piece down to clean, white metal...you don't want to use a grinding wheel or flap disc as they leave behind residue (at least sometimes). I get the pieces set up and then run just an arc at low amperage (no filler) along the area to be welded. You'll get black soot coming out of the cast iron...that's carbon. Stop, use a stainless brush to clean off the carbon and repeat a few times until the black soot stops, then put down your first pass with filler rod. Cooking the carbon out seems to make a big difference and it also adds some preheat to the work as well.

    If it's a small piece that you didn't put a lot of heat into you may not even have to worry about trying to cool it slowly. If it's bigger, and/or got hotter I'll throw a welding blanket over the work to help keep heat in it longer.

    If there is any way you can do a practice weld with similar pieces that's always a good idea since older cast iron can really be mystery metal and there's no way of knowing exactly what you're dealing with.
    Check out my bench vise website:
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  12. #11
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    Re: TIG welding cast iron

    You can weld with cast iron rod.
    When had a TIG weld I would weld with cast iron rod you still need to per heat

    Dave

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    Re: TIG welding cast iron

    Quote Originally Posted by Sophie View Post
    If you also want to know the procedure. I am sharing a link about welding cast iron here. Hopefully it would be helpful.

    More spam! She's Sophie on Welding Web and Emalia John on the link she posted about cast iron, says she's from Texas but her language skills scream India , or some other scam place.
    Last edited by CAVEMANN; 4 Weeks Ago at 03:46 PM.
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  14. #13
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    Re: TIG welding cast iron

    Quote Originally Posted by Sophie View Post
    If you also want to know the procedure. I am sharing a link about welding cast iron here. Hopefully it would be helpful.

    Emilia, that’s a good overall summary article about the options.
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  15. #14
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    Re: TIG welding cast iron

    Quote Originally Posted by CAVEMANN View Post
    More spam! She's Sophie on Welding Web and Emalia John on the link she posted about cast iron, says she's from Texas but her language skills scream India , or some other scam place.
    I did not get that impression from reading the article, but you may be right.
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