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  • CarlM11 commented on DIY Dave's instructable AC Arc Welder FAIL3 years ago
    AC Arc Welder FAIL

    I don't think perfect phasing error with identical transformers would do it. If out of phase, the voltage would be zero. Two identical transformers connected out of phase and sorted would deliver no current to the load, and (other than losses) draw no current from the wall. If the transformers were not identical enough, you could have some voltage, but too little voltage to strike and maintain the arc. Shorted electrodes, even with low voltage, would cause high currents to flow, which could overheat transformers and blow breakers.When working properly, most of the output voltage from an arc weller is expressed across the arc, creating the heat to build the melt pool. A key skill of stock welding is to keep the arc length optimized for the energy dissipation needed, while not destro...

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    I don't think perfect phasing error with identical transformers would do it. If out of phase, the voltage would be zero. Two identical transformers connected out of phase and sorted would deliver no current to the load, and (other than losses) draw no current from the wall. If the transformers were not identical enough, you could have some voltage, but too little voltage to strike and maintain the arc. Shorted electrodes, even with low voltage, would cause high currents to flow, which could overheat transformers and blow breakers.When working properly, most of the output voltage from an arc weller is expressed across the arc, creating the heat to build the melt pool. A key skill of stock welding is to keep the arc length optimized for the energy dissipation needed, while not destroying anything.

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