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Building DIY welder and need some info

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    Building DIY welder and need some info

    I have built my DIY tab welder and now a a point were I need to decide what weld voltage I want. I can wind the transformer to get anything from 1 to 20 volts output. Does anyone know the open circuit voltage of the factory made spot welders ? Youtube videos from using low as 1v or up to 12v from car battery, seems the weld voltage can vary alot
    waiting to install the transformer
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