weak welding magnets
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  1. #1
    Join Date
    Dec 2010
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    Seattle
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    320

    weak welding magnets

    I am doing some spring cleaning. A buddy stopped by to pick up a tool. On his way out I offered him a handful of the smallest size of those red triangular welding magnets. I always found them useless because they were so weak. He laughed at me and told me to belt sand off most of the steel on the edges, the bit that sticks out past the magnet. I tried that and yup, much stronger. The magnetic attraction varies inversely as the square of the separating distance. Cut the distance by half and the forces increase by 4X.

    Wish I'd thought of that!

    metalmagpie

  2. #2
    Join Date
    Apr 2019
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    PNW
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    111

    Re: weak welding magnets

    I have some of those small "magnets," I can't even really consider them magnetic.

    I have them "stuck" on one of my welding tables legs, if I so much as bump up against the table they fall off. In fact I have no idea why I haven't thrown them away yet.

    I guess I should try and grind them down, but then again 4 times zero is still zero.
    Just say, Know.

  3. #3
    Join Date
    Dec 2018
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    1,965

    Re: weak welding magnets

    Those things are ok for setting stuff up relatively square, but ya have to make sure you make the tack on the "long" side of the metal so you can use it as a hinge to make it right.

  4. #4
    Join Date
    Apr 2008
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    NW ON Canada
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    3,271

    Re: weak welding magnets

    Keeping them clean is important. It's also difficult.
    Jason
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  5. #5
    Join Date
    Apr 2017
    Location
    Long Island, NY
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    285

    Re: weak welding magnets

    Quote Originally Posted by snoeproe View Post
    Keeping them clean is important. It's also difficult.
    Compressed air works wonders to blow off the crap
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  6. #6
    Join Date
    Jul 2018
    Location
    Cumbria, UK
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    612

    Re: weak welding magnets

    hate them. Just hate them.

    I use big fab squares for anything big, and small machinist cast iron angle plates for smaller stuff. We bought a few of these red magnetic things a few years ago but I can count on one hand how many times I've used them, and probably only actually had one or two jobs where I've thought, now that worked pretty well...

  7. #7
    Join Date
    Dec 2016
    Location
    New Jersey
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    113

    Re: weak welding magnets

    Quote Originally Posted by snoeproe View Post
    Keeping them clean is important. It's also difficult.
    SO - all my magnets were caked in iron filings from use. Googled cleaning them and found a video that worked beautifully - just use a smallish wire brush and brush each side off into a garbage can - the filings do fly off pretty good. it's a helluva lot easier than trying to wipe them off or pick them of. Not sure if compressed air would work - hadn't gotten around to trying that - the steel/wire brushing works great though - there's a video on it.

  8. #8
    Join Date
    Nov 2012
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    955

    Re: weak welding magnets

    Quote Originally Posted by henry42 View Post
    Compressed air works wonders to blow off the crap
    Blowing chips off is a good way to have one fly into your eye or someone else's eye. It will also blow chips into place where you don't want them, Like the $$$$ electronic control board of your welder.

  9. #9
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    Apr 2017
    Location
    Long Island, NY
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    285

    Re: weak welding magnets

    Quote Originally Posted by FlaJoe View Post
    Blowing chips off is a good way to have one fly into your eye or someone else's eye. It will also blow chips into place where you don't want them, Like the $$$$ electronic control board of your welder.
    No, you can't be stupid about how you do this. I blow them off while still wearing my welding/grinding helmet and aim the blowing onto a patch of grass (I figure the iron is good for the soil?). And, when doing this I make sure that nobody is anywhere around!
    Lincoln Invertec V205-T Tig/stick
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    Millermatic 211 Mig Welder
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    FW3012 CertiFlat fabWing 30" X 12" Extension Table

  10. #10
    Join Date
    Dec 2014
    Posts
    42

    Re: weak welding magnets

    Stainless steel wire brush works the best...no fuses at all.

  11. #11
    Join Date
    Jul 2008
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    2,288

    Re: weak welding magnets

    Quote Originally Posted by FlaJoe View Post
    Blowing chips off is a good way to have one fly into your eye or someone else's eye.
    So....maybe you shouldn't point the air gun toward your face when you blow off the magnet...?

    Just a guess / hope this helps

  12. #12
    Join Date
    Mar 2005
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    Under a Rock
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    4,824

    weak welding magnets

    Wax on / Wax off.

    EZ-PZ





    Sent from my iPhone using Tapatalk Pro
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    True Wisdom only comes from Pain.

  13. #13
    Join Date
    Nov 2014
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    PDX PNW
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    8,633

    Re: weak welding magnets

    Quote Originally Posted by Kelvin View Post
    So....maybe you shouldn't point the air gun toward your face when you blow off the magnet...?

    Just a guess / hope this helps

    Even with the blow gun pointing in the opposite direction the metal shaving will go everywhere. Kinda like a ricochet. That’s why I use light pressure before going full bore and also turn your head and safety glasses

  14. #14
    Join Date
    Nov 2012
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    955

    Re: weak welding magnets

    I use a show vac. it gets them off with little chance of them ricocheting and disposes of them at the same time. As long as the shop vac isn't full of trash, I empty it around the trees and bushes. It makes good mulch/ fertilizer. I also paint in my shop and I can't have it covered with grit and grime.

  15. #15
    Join Date
    Jun 2012
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    Laredo, Tx
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    4,223

    Re: weak welding magnets

    There ya go, put a large funnel on end of a shop vac hose, then used compressed air to blow the grit off the magnet while holding it in very close proximity to the funnel, preferably inside!
    1st on WeldingWeb to have a scrolling signature!

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  16. #16
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    Mar 2005
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    Under a Rock
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    weak welding magnets

    Good point joe... I often use the shop vac also...

    actually it's a standup... with a plastic canister ..... works great.
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    Hypertherm PM 45
    1961 Lincoln Idealarc 250
    HTP 221


    True Wisdom only comes from Pain.

  17. #17
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    Nov 2014
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    Re: weak welding magnets

    John what do you really use that vacuum for?

  18. #18
    Join Date
    Nov 2012
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    955

    Re: weak welding magnets

    Quote Originally Posted by motolife313 View Post
    John what do you really use that vacuum for?
    The picture that he posted looks,, Well, rather suggestive.

  19. #19
    Join Date
    Mar 2011
    Location
    Western Washington
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    4,348

    Re: weak welding magnets

    Quote Originally Posted by mp4 View Post
    Stainless steel wire brush works the best...no fuses at all.
    I'll second this!!!! even a regular $1 HF wire brush will get 95 percent of the shavings off the most powerful magnets I got Plus it keeps the rust at bay

  20. #20
    Join Date
    Aug 2018
    Posts
    131

    Re: weak welding magnets

    Yes, yes..Negative on using compressed air in my shop to clean "said" magnets. I use a nice stiff bristle brush...
    Welds last longer than Love...

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