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  • #91
    I bet you can't get a dual voltage machine rated at 30 amps 240 volts hot powered by 20 amps 120 volts. Only 1/3 the input heat. The breaker's purpose shouldn't be to prevent internal heat in the welder, but it does limit. Other factors apply.
    Dynasty 280DX
    Bobcat 250
    MM252
    Spool gun
    Twentieth Century 295
    Twentieth Century 295 AC
    Marquette spot welder
    Smith torches

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    • #92
      I agree, it does limit. Especially the 120V, the machine will output more than a 20 will allow..

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      • #93
        in a welder circuit the breaker rally doesnt protect the wire or its own cord, the internal of the machine do,,, or the limit, the load calc what ever we might call it for lack of any better wording. Machine will shut down before it hurts the wire its connected to provided its adequate

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        • #94
          The page I might have posted was from a red machine about 93, maybe. Was about 1800 bucks maybe, 1850, was the economy simple base model. Its been so long since I cracked the manual but its interesting to note they list the nature of the thermal. If it runs long enough it will shut down on simple switch, if it short circuits it will shut down other means.
          What happens to a AC buzzer if it shorts a secondary with the minimum circuit wire? The breaker must catch the rise before it overheats the wire???? I know a guy can build a semi tanker in the back yard with one, box of 1/8 7014 connected with a 10 cable to the power pole. Ha. 145A, 11 ga on a few roofing truck dump boxes too.

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          • #95
            Guy I worked for had done it about 2 dozen times, a conversion and made all but a couple hinge parts from 10 or 11 fa, could hav been some 12 but he had couple 3 of us help him put it together , all rather stitched, fast and down on the verts. I remember a company owner stopped by and watched a while one day and he walked over and handed me an extra 20$ Had a gallon of black paint ready to spray on, could paint the while side in a couple quarts easy with 1/2 gallon mineral spirits.
            I have heard of buzzers burning up but I never did one or have never hit a thermal on a machine and tried a few times. When a sprout weld up a trailer, dump box, several times weld quite a bit a whole big ole handful of lo hy pr 7014 or even 6013 with ACs and figured I would just cook one but never did.
            Sberry
            Senior Member
            Last edited by Sberry; 11-04-2021, 05:47 PM.

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