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HF Spot Welder Hand Gun ??

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  • HF Spot Welder Hand Gun ??

    Anyone tried one of these?
    "Good Enough Never Is"

  • #2
    Haven't tried it, but I'm not sure what it could be used for except maybe shrinking metal. Normally, spot welds are created by pressing the two pieces of metal together and flowing a current through that spot. I don't see how that would work on this. Even if you could press the front piece into the one behind it, the current would likely flow through much of the backpiece making it difficult at best to get it concentrated on the spot you want welded.

    It looks to me like the only real benefit to this is that it gives you a way to pull the electrode off the workpiece by pulling the trigger.

    Just my 2¢

    Dave
    Still building my new old truck - see the progress!
    http://www.ford-trucks.com/forums/65...-coe-idea.html
    http://www.hobartwelders.com/weldtal...ad.php?t=27017

    Square Wave TIG 200 - Woot!
    MM180
    SP125+

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    • #3
      I agree, WhategO...I have use spot welders, and am familiar with how they work, but can't figure how this does it just from the front, either. I've been plug welding in situations this would be used for...
      "Good Enough Never Is"

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      • #4
        Have seen similar ones but connected to a dedicated power source
        Cheers

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        • #5
          Hey Hotfoot,
          Kinda thought you knew how they normally worked. Didn't mean to insult you like that. If you do get one, let us all know how it works. Doesn't really make sense to me.

          Dave
          Still building my new old truck - see the progress!
          http://www.ford-trucks.com/forums/65...-coe-idea.html
          http://www.hobartwelders.com/weldtal...ad.php?t=27017

          Square Wave TIG 200 - Woot!
          MM180
          SP125+

          Comment


          • #6
            Let me try some reverse engineering

            It looks like the metal crown around the electrode is designed to compress (or hold) sheets of metal while they're being spot welded in the center (electrode area).

            I guess the electrode is suspended with a spring, so it retracts when the gun is pressed against the sheets. The ground will be attached to the opposite sheet or to both sheets, if the fixture is for butt welding only (which is most likely, IMO).

            And although, theorectically, the crown could've been used for grounding both sheets during butt welding, I'm pretty sure they left it isolated. It would be a very poor ground with this toy looking gun.
            Last edited by MichaelP; 12-28-2008, 10:23 AM.

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            • #7
              Originally posted by MichaelP View Post
              It looks like the metal crown around the electrode is designed to compress (or hold) sheets of metal while they're being spot welded in the center (electrode area).

              I guess the electrode is suspended with a spring, so it retracts when the gun is pressed against the sheets. The ground will be attached to the opposite sheet or to both sheets, if the fixture is for butt welding only (which is most likely, IMO).

              And although, theorectically, the crown could've been used for grounding both sheets during butt welding, I'm pretty sure they left it isolated. It would be a very poor ground with this toy looking gun.
              Hmmmm..I think ya' got something there, Michael!

              "Good Enough Never Is"

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