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convert an ac welder into a dc one

Discussion in 'Electronic Basics' started by Lorenzo, Apr 1, 2004.

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  1. Lorenzo

    Lorenzo Guest

    Hi l'd to know if it is possible to convert a AC welder into an Dc one
    simply
    using an Hi-power diode bridge.

    thak you in advance for your reply

    Lore
     
  2. Don Bruder

    Don Bruder Guest

    Possible? Yes. Practical? Ehhhh... debatable.

    The problem is finding diodes that are beefy eough to handle the current
    without letting all the smoke out of 'em.
     
  3. A diode bridge is no problem, but the result is not a practical DC
    welder. You need to add a hulking big inductor downstream of the
    bridge, to stabilize the arc, or you just produce a lot of splatter.

    A couple of these duals or 4 singles mounted on heat sinks make a
    passable diode bridge:
    http://rocky.digikey.com/WebLib/InternationalRectifier/Web Data/IRKD,E,J,C 91 SERIES.pdf

    Big diodes are often for sale on EBAY, also. e.g.
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3807560657&category=7287
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3806442995&category=36332
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3807594327&category=36332
     
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