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  1. #1
    Elite Member
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    Bobcat CT225

    Default Scorch/melt on ground clamp

    I noticed a scorched/melted part on my ground clamp today.

    Scorch/melt on ground clamp-img_20130403_134051_577-jpg

    My best guess is that when I had it clamped on the table, the woven copper bridge between the two jaws arced to the table, as shown below.

    Scorch/melt on ground clamp-img_20130403_134135_892-jpg

    It could also be that the woven copper bridge arced to the clamp itself, but that seems unlikely, as it would seem to be an unavoidable design defect, and this is a pretty standard design for a ground clamp.

  2. #2
    Veteran Member
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    Default

    yes, if your table is painted or rusty it might not make good contact. I like to twist the clamp back and forth after clamping it on to let the copper jaws rub through any 'gunk' to make better contact.
    Dan H.

  3. #3
    Epic Contributor k0ua's Avatar
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    Kioti DK35se Hydrostat

    Default Re: Scorch/melt on ground clamp

    Yep, that is what happened, I had it happen to me a couple of times too, from not having the contacts on good clean metal, and the braid was touching bare metal.. happened on the lip of a FEL bucket, too much paint further back but the edge where it touched the braid was bare... whoops.
    James K0UA

    Kioti DK35se hydrostat with 2 QA buckets, 48 inch. King Kutter Rotary Cutter. 750 lbs ballast box. Loaded tires, Construction Attachments SSQA Lightweight Pallet forks. EA 50 inch single lid "wicked" Grapple. Satisfied Everlast PA160 welder owner NRA Life Member How to add a link to a post . Best way to search TBN .


  4. #4
    Elite Member
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    Default Re: Scorch/melt on ground clamp

    It's odd, because the "teeth" of the clamp were on clean, bare metal (the table top). But I know that anywhere there's a small gap will arc, so my guess is I shouldn't have put the clamp so deep on the table.

  5. #5
    Elite Member
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    Default Re: Scorch/melt on ground clamp

    I wonder if it would be worthwhile to paint the braided strap with paint-on electrical tape, to prevent this from happening in the future.

  6. #6
    Epic Contributor k0ua's Avatar
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    Kioti DK35se Hydrostat

    Default Re: Scorch/melt on ground clamp

    Quote Originally Posted by joshuabardwell View Post
    I wonder if it would be worthwhile to paint the braided strap with paint-on electrical tape, to prevent this from happening in the future.
    That might not be a bad idea. I hadn't thought of that.
    James K0UA

    Kioti DK35se hydrostat with 2 QA buckets, 48 inch. King Kutter Rotary Cutter. 750 lbs ballast box. Loaded tires, Construction Attachments SSQA Lightweight Pallet forks. EA 50 inch single lid "wicked" Grapple. Satisfied Everlast PA160 welder owner NRA Life Member How to add a link to a post . Best way to search TBN .


  7. #7
    Elite Member
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    Default Re: Scorch/melt on ground clamp

    Quote Originally Posted by k0ua View Post
    That might not be a bad idea. I hadn't thought of that.
    I'm also thinking I may have some heat-shrink that would fit perfectly, which is nice, because I don't currently have any liquid electric tape.

  8. #8
    Elite Member
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    Default Re: Scorch/melt on ground clamp

    I'm not too worried about it, though. Even with half the braid melted through, I would think that the remaining copper should be more than adequate to carry the welding current without excess resistance.

  9. #9
    Elite Member
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    Default Re: Scorch/melt on ground clamp

    Two layers of heat shrink later...

    Scorch/melt on ground clamp-2013-04-03-15-12-a

  10. #10
    Super Member Shield Arc's Avatar
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    Default Re: Scorch/melt on ground clamp

    I've always had good luck with this kind of ground clamp.
    Tweco Copper Ground Clamp - GC 200


    Miller Dynasty 300.
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