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Thread: Lincoln 225 AC Conversion to DC

  1. #1

    Lincoln 225 AC Conversion to DC

    I've read thru several threads where the poster converted a Lincoln 225 AC welder to a DC welder. Has anyone here ACTUALLY done such a conversion? The reason I ask, is last Sunday at dumpsters, two guys were fixing to trash an older Lincoln 225 AC machine, which now resides in my shop. There seems to be two items needed, a bridge rectifier (less than ($40 on ebay) and a choke coil. The coil can be made from the transformer in a microwave oven. I am replacing an over the stove microwave oven for a friend this week, so transformer isn't a problem.

  2. #2
    Years ago I picked up a DC converter box. Works great. Maybe you could watch E-bay for one.

  3. #3
    Quote Originally Posted by Kevin Beitz View Post
    Years ago I picked up a DC converter box. Works great. Maybe you could watch E-bay for one.
    On one of the welding forums, I saw such. It's a full wave rectifier that comes as a kit, or prebuilt. Uses individual diodes, which you have to wire in place. Now you can get a full wave bridge rectifier from China in just a few days. Around $40 for a 300 amp, 1600 volt one. Over the weekend, started gutting microwave oven transformer. Was surprised to find that windings were aluminum, instead of copper.

  4. #4
    Received my full wave bridge rectifier, and have built my choke using MOT (microwave oven transformer.) Ordered a crimper for leads, which should be here tomorrow. Watched another build of Miller Thunderbolt conversion to DC. Gave Lincoln to BIL, so I will do my Thunderbolt instead.

  5. #5
    Join Date
    Jan 2006
    Location
    Chicagoland
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    I was ready to mod a HF welder but then found a DC Lincoln for a good price on CL. There was a ton of info on weldingweb.. Don't you need to purchase a big cap too?

  6. #6
    [QUOTE=Mike Goetzke;2817774 There was a ton of info on weldingweb.. Don't you need to purchase a big cap too?[/QUOTE]Weldingweb is where I picked up info on adding DC to an AC machine. You don't have to have the big capacitor.

  7. #7
    Got the last of my parts today, but now I'm in the middle of a "RUSH" cabinet job for local "Y." Welder will have to be put on "back burner " for a while. Why is it that I either don't have the money, or don't have the time?

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