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Thread: Will magnets cause arc blow?

  1. #1
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    Will magnets cause arc blow?

    Understanding that magnetized steel can cause arc blow when using DC, does the use of the right-angle magnets similar to these to hold pieces together while tacking or welding cause arc blow?

    Seems that the magnetic field created when those are used must be greater than, say, used oil field pipe or similar magnetized material.
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  2. #2
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    Re: Will magnets cause arc blow?

    Yes they do screw with your arc

    Try to tig weld next to one with low DC current

    On youtube watch The Story of Alternating Current Arc Welding - 1944
    About minute 3:00 they actually show it.


    Dave J.
    Dave J.

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  3. #3
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    Re: Will magnets cause arc blow?

    Quote Originally Posted by MinnesotaDave View Post
    Yes they do screw with your arc

    Try to tig weld next to one with low DC current

    On youtube watch The Story of Alternating Current Arc Welding - 1944
    About minute 3:00 they actually show it.


    Dave J.
    That was a pretty convincing video. Thanks for posting it.

    I used one of the magnets to hold a couple of pieces of steel at right angles for about a 1" bead and as an afterthought, noticed that the arc had been much more erratic than the following beads after I removed the magnet. At first, I thought it was just me and a lousy bead, but now I realize it must have been the mag. I was using some 5/64" 6013 DCEP for a small project that didn't need as much penetration and the magnet probably just ate that small rod's lunch.

  4. #4
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    Re: Will magnets cause arc blow?

    You're probably right - little arc didn't have a chance

    My friend learned it by experience too. Tried to tig right over where the magnet was. No dice.

    Dave J.
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Syncro 350
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  5. #5
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    Re: Will magnets cause arc blow?

    http://weldingweb.com/vbb/showthread.php?t=61966

    Here is a problem I had with magnets.

    Dan

  6. #6
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    Re: Will magnets cause arc blow?

    You have the arc wander issue, which I haven't experienced, because when I tried to tig with magnets holding material, the filler was not very fun to manipulate. Kept wandering toward the magnet.
    -Aaron
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