Many YouTube sites have plans for adapting a microwave transformer to supply a spot welder. European (including British) sites are working with 220 volt, 50(?) cycle transformers. Can the transformers in North American microwaves (110-120 volts) be used with the 220 volt circuits for clothes dryers & ranges? Using the higher primary voltage would give greater power (I think?). Assuming this is doable, how would it be wired? Is a neutral required?