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Transformers In Parallel

Discussion in 'General Electronics Discussion' started by ag273n, Apr 9, 2017.

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  1. ag273n


    Nov 24, 2016
    i built myself one of those microwave oven transformer spot welders thats famous in youtube.. Mine had an output of approx. 800A - 2.8V.. this went well, i can now weld together thin sheets of metal thats about 3mm combined.
    so i'm wondering. if i have two of these transformers and wire their output in parallel and parallel input.. should i be getting twice the Amps?...

    side note: along the way of making it, i hit my two fingers with the hammer, and even broke a 4mm drill bit that accidentally bore a whole on one of the fingers i accidentally hit with the hammer.. -- totally a bad day, but all worth it, its working!:D

    CDRIVE Hauling 10' pipe on a Trek Shift3

    May 8, 2012
    Damn! I love your "Git er done" hammer and hole in the finger attitude!

    Yes you can parallel transformers but they must be in phase with each other. The other issue is if the output voltage of each transformer are not exactly the same the higher voltage transformer will back feed into the lower voltage transformer. If you can get your hammered - drilled hands on high current Diodes this won't be an issue. Welders prefer DC anyway.



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  3. ag273n


    Nov 24, 2016
    Thanks CRDrive, the one i created only has AC output. I hear in Stick welding, DC is better to use than AC. not sure how this compares in Spot welders.
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