• I did find that this does work for welding but takes a bit more time that using the battery spot welder. 
  • Using the micro-controller and starter relay didn't seem to work well. 
  • Should probably investigate other timer ideas. 


Pics from Others


References

ReferenceURL
I Made a Battery Spot Welder from an Old Microwave and Excessive Mahoganyhttps://www.youtube.com/watch?v=6w9dFNRtqlg&t=13s
DIY Spot Welder From Microwave - Now With OLED Display!https://www.instructables.com/DIY-Spot-Welder-From-Microwave/
spot welder Mk 1.wmvhttps://www.youtube.com/watch?v=RnjF5Hj2Udg&t=378s

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