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AC to DC welder?

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  • AC to DC welder?

    Hello everyone.

    I currently own a 120VAC Firepower SMAW welder. I am interested in adding a DC feature to it. I have a degree in EE so the actual circuitry is not a problem for me. What I do not know and cannot seem to find any information about how "clean" the DC is. Does anyone know how well the DC in a factory built DC welder is regulated (How much AC ripple is acceptable)? Thanks
    Trent

  • #2
    When I opened up my old ac/dc buzz box welder (an old Miller Thunderbolt clone) I noticed there were no capacitors so that should tell you the level of filtering... I would guess that it's simple full wave rectification. I'm sure newer models filter a bit more but my welder seems to work well on dc this way.

    hope this helps,
    jumper

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    • #3
      I put a full wave bridge rectifier and a choke on my 220 volt welder, no caps.
      What do I know I am just an electronics technician.

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      • #4
        Capacitor is for MIG (Constant Voltage) .

        Choke is for TIG and Stick (Constant Current) .

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