I designed models for making spot welding.

you can make cheap spot welding using the models.

you can also refer to video below.
https://youtu.be/1cNdcw5bEFI

I bought some stuffs below.

spot welding controller :
https://www.aliexpress.com/item/32808302953.html?spm=a2g0s.9042311.0.0.171f4c4d5NU60S

spot pen
https://www.aliexpress.com/snapshot/0.html?spm=a2g0s.9042311.0.0.171f4c4d5NU60S&orderId=99717324405584&productId=32811626116

9V AC transformer
https://www.aliexpress.com/item/32807729529.html?spm=a2g0s.9042311.0.0.171f4c4d5NU60S

thanks.