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120V MOT transformer on 220V for spot welding machine? Answered

Hello i'm making a Spot welding Machine using a microwave transformer i'm removing the secondery coil to replace with 2 rounds of very thick wire for the output .
the only problem is the transformer rated for 120V input
Will it matter if i connect the primary to 220v ? i'm replacing the secondery anyway ?

Discussions

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steveastrouk

Best Answer 4 years ago

You'll find it will probably throw the circuit breaker. The core will saturate, and there will be no impedance to the flow of current. Bang.

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pixemasteveastrouk

Answer 4 years ago

I tried it for a split second and that's exactly what happened

Thank you for explaining good thing i have a 220v to 110v transformer i guess i'll be using instead of connecting the 120v spot welder transformer directly

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steveastroukpixema

Answer 4 years ago

you'll move the problem up the chain, unless that transformer is wildly overrated for the 120. Transformer

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pixemasteveastrouk

Answer 4 years ago

Here is what i did i connected the step down transformer 220v in and 110v out then connected the microwave transformer on the 110v out from first transformer and it worked perfectly , i also tried welding with the custom MOT secondery i've made and it's working perfectly i'm sure the 10v gonna make a slight performance decrease but that's better than blowing up the fuses

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thematthatterpixema

Answer 4 years ago

see what your stepdown transformer is rated for. Knew somone who plugged an air compressor into one and it blew the fuse.

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magadheerk

3 years ago

hi im dheeraj can i make any modification so that i can give 220v 50hz to 120v rated transformer