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Step 3Moding the Transformer
Microwave oven transformers are step up transformers. That means that the voltage at the secondary winding is higher than the primary 120 volts. The secondary voltage is typically 4000 volts. Replace low voltage winding with #6 Single conductor wire, about 10-18 wraps. The load will change to 10 volt, and during welding will be about 2-4 volts at 250 amps.
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Jun 23, 2008. 12:51 AMmicrowavedisplayDOTcom
says:
Paul213 is right. The primary (low voltage) must be left undisturbed. It is the secondary winding (former high voltage, post-mod low-voltage winding) that is to be changed. That's right: Leave the primary (110V) coil alone. Do not disturb the primary!!!
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Apr 12, 2008. 7:00 PMPaul213
says:
You say replace the low voltage winding (that would be the 110v winding).I think you ment "replace the secondary winding"
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