Author Topic: Mini Spot Welder from Aliexpress  (Read 2441 times)

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Offline Fraser

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Re: Mini Spot Welder from Aliexpress
« Reply #25 on: June 12, 2021, 11:50:08 am »
Normally only one MOSFET dies and it has been proven that the unit still works well with one MOSFET removed. Other mini welder type units use less MOSFET’s and also work well. So do the various modifications for your version of the Welder and try using it with the faulty MOSFET removed. You should be fine  :-+ To find the dead MOSFET you can apply a voltage across the MOSFET bank and current limit the power supply to a sensible level. Then use an IR thermometer or apply IPA to see which MOSFET gets warm due to an internal short.

« Last Edit: June 12, 2021, 11:52:22 am by Fraser »
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