Spot Welder – Kerry D. Wong

How Does a Spot Welder Work? Review, Teardown and Analysis of a BIFRC DH20 Battery Spot Welder

December 10, 2021 By kwong

A while back I built a spot welder with an old microwave oven transformer (MOT). Since then, I have used it in many of my projects including using it to make a battery bank. While that spot welder does an…

Dual Purpose Spot Welder With Pulse Duration Control

June 18, 2017 By kwong

I had wanted to make a spot welder for a while. Most of the DIY spot welders use a momentary switch the primary side of the microwave oven transformer (MOT). Due to the simplicity of this design, it is very…