Tuesday, July 15, 2008

MOT Welder: 01

Captain's log:
Build a Microwave Transformer Homemade Stick/Arc Welder

Today I received my 10 gauge wire and I popped the secondary windings out of a couple microwave oven transformers (MOT).

Tomorrow I will wind the new secondary. Wish me luck.



  1. great ! 2 of the same watts 900 or better yet 1100
    leave the shunts in ,why you say well if you do not know then you should not even build this !

    10 gauge you say big wire, but not good enough!
    NEED 4 and how many turns you say 3 0r 4 ?

    with 10 AWG you need 20 turns and a lot of swear words ha ha ! really !

    About 12 volts & between 30 and 50 amps

    4 AWG 3 or 4 turns makes a lite spot welder for tin so i will leave the 4 AWG set up for you to solve good luck and these are really good tips proven ones !

  2. the "instructables.com" person isn't me, I was going off their instructions.
    In http://nakedproof.blogspot.com/2008/07/mot-welder-02.html I talk about how I wound 20 turns with the 10GA wire.

    Thanks for the good proven tips!