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Thread: How much current should use?

  1. #1
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    How much current should use?

    I want to weld a 12mm thick by arc welding and using size 10 or size 12 electrode. How much the recommended current shoud i use?

  2. #2
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    Re: How much current should use?

    I wonder what it is that you might be welding?

    mild steel

    pipe

    plate

    cast iron

    aluminum

    stainless

    titanium



    I wonder what you are welding it to?

    I wonder if it's load bearing, like a bridge column or maybe a trailer, or could it be a lamp shade holder?

    More info would help.

    What type of electrode? Is it AC or DC?
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  3. #3
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    Re: How much current should use?

    What he said plus what's a size 10 or 12 electrode? Is this same strange code like 10 being 10/64ths?

  4. #4
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    Re: How much current should use?

    What on earth is size 10/12 electrode???

  5. #5
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    Re: How much current should use?

    It can't be 12 mm plate and a 10mm (.400") rod.

    3/8" =.375"

    David
    Last edited by David R; 10-04-2007 at 11:28 PM.
    Real world weldin.

    When I grow up I want to be a tig weldor.

  6. #6
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    Re: How much current should use?

    Oh, I must have missed the mm part.

  7. #7
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    Re: How much current should use?

    "What we've got here is failure to communicate"

    Washman

  8. #8
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    Re: How much current should use?

    is welding 12mm thick mild steel plates.

  9. #9
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    Re: How much current should use?

    Not enough info but in the US we use a rule of thumb that says the dia of the rod in thousands of an inch is the number of amps. So a 1/8" = 0.125" would be about 125A. I think this works out to about 4A per mm. This rule is only a rough guide and the dia refers to the dia of the steel rod inside the stick
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  10. #10
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    Re: How much current should use?

    40 amps per mm thickness. 1mm = .039something inches.
    The rule of thumb is for one pass welding. Multi pass you can go less and it depends on the diameter of the wire part of the rod and what kind it is.

    Which brings me to another rule of thumb (put thumb smily here)

    .001 " for one amp works for rod size too. 1/8" rod AROUND 125 amps. Or 40 amps per mm of rod.
    That is why I asked about 10 mm? rods. 400 amps?


    David
    Real world weldin.

    When I grow up I want to be a tig weldor.

  11. #11
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    Re: How much current should use?

    Yea yea yea....

    12mm thick lamp shade

    yea yea yea

    I vote for that!
    Don't talk about it, Just do it!

  12. #12
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    Re: How much current should use?

    Quote Originally Posted by David R
    40 amps per mm thickness.
    David

    Yeah thats right. My mistake
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  13. #13
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    Re: How much current should use?

    12mm thick mild steel plate
    electrode size 10 = eldectorde diameter 2.0mm
    electrode size 12 = electrode diameter 2.6mm

  14. #14
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    Re: How much current should use?


  15. #15
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    Re: How much current should use?

    So 2.0 mm start at 80 amps. 2.6 104 amps.

    These are only recommendations. You may have to turn it up or down depending on the type of electrode you are using.

    David
    Real world weldin.

    When I grow up I want to be a tig weldor.

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