DIY Lincoln welder conversion

[Fritz] built this 600 joule capacitive discharge spot welder in a case scavenged from a Lincoln plasma cutter. All of the circuitry was designed by [Fritz] and the schematics are available on his website. He has a few other welding related project also documented on his site that are worth checking out. While this isn’t the first homemade spot welder we have seen, it is definitely the first one with a case mod. If you are not up to the challenge of building one quite as complex as [Fritz]‘s example, a microwave can be used as the donor appliance in simpler designs.


  1. Pouncer says:

    That was a thing of beauty!

  2. thedudefrommiamivice says:

    Holy crap a hack got posted! Thanks guys, more like this please and less matchbook cars. This is very very cool.

  3. Spadefinger says:


  4. Polaczek says:

    Wow, that is sweet! Hats off to him.

  5. ejonesss says:

    can you post the schematics in a printable/downloadable form?

    you seem to have disabled them on your site.

  6. The Moogle says:

    I would so buy one of these from this guy!

    Kits please!

  7. Taylor says:

    miller is better…

  8. Well the title is a bit off

    DIY Lincoln welder conversion

    it’s not a conversion of a Lincoln welder, it’s a conversion of a plasma cutter into a DIY welder. Or maybe just a plasma cutter _case_ into a welder.

    Everything awesome except the title.

  9. aonomus says:

    I’m wondering what kind of life those audio capacitors get (1F+), I don’t think they are like regular electrolytics with aluminum plates, but I could be wrong…

  10. Don says:

    Wow I really need one. Great work!

  11. Marvin says:

    Nice Project, but why is there always some gay music?

  12. nnx says:

    @Marvin: Well he knew that you were watching, so he chose the music appropriately.

  13. finaly says:

    This is not a hack. There is no arduino and it can’t be controlled by twitter.

  14. Rachel says:

    You know, we never did see a writeup for the spot welder’s power controller…

  15. Satiagraha says:

    I love the fact that he used a PIC instead of an Arduno :P It’d be nice to see some source code for the PIC and also what language he programmed it in and what compiler he used.

  16. samurai1200 says:

    you know how i know you’re gay?

  17. ken says:

    OK, beautiful job on the spot welder, but the wire diameters listed in the video are completely wrong. A strand of wire one tenth in diameter (0.0001″) would not be visible in the video. Besides which, that diameter is one third the smallest Brown and Sharpe wire gauge (60 AWG), and the whire show is far, far thicker.

  18. Satiagraha says:

    How is this a 600 joule cap? 3 farads at 25V means 1/2*3*25^2= 938 Joules. Granted you can only get out maybe 600 joules before the discharge pulse becomes long.

  19. Josh says:


    How about 20v at 3 farads = 600 joules….I’m trying to figure out if you are trying to be funny or are just plain stupid.

    Nice welder!!

  20. this is a really great hack and what I love to see here on HAD.

    if there was a rating system in place I’d give it 5 stars…

    that reminds me
    HAD uses wordpress no? why not add in Ajax Star Ratings, there’s no plugin but it’s pretty easy to add to WP.

    that way people can click their like/dislike of an article as opposed to voicing it, and the comments might be more on-topic.

  21. jim says:

    Impressive. I imagine every single weldable object in his is now welded to one another.

  22. jim says:

    Oops I accidentally the whole thing :)

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