I built a capacitive discharge battery tab spot welder (portable, USB-C powered, no microcontrollers, thyristor-based). No custom PCBs, mostly off-the-shelf components. : r/DIY
Diy battery Spot Welding Machine, Homemade Spot Welder with automatic
Diy Spot Welder 18650 Batteries | Mini Spot Welding Batteries - 5000w Mini Spot - Aliexpress
Make Your Own Crude Battery Spot Welder With a Car Battery! : 5 Steps - Instructables
18650 Spot Welder – Car Battery Powered | Hackaday.io