I have been trying to make a DIY spot welder from car batteries and Arduinos for weeks and have had no success. As a result I’ve opted for soldering. I know the basics: don’t short, hot soldering iron and small contact time to reduce heat. However this is my first time and would appreciate any advice or help this community can give! I’m using nickel strip and 60 year-old lead roof welding tool as it has a huge thermal mass.
N.b. Video is completely unedited
[Video of soldering ](https://youtu.be/7elmqgiLpKk)
Some screenshots from the video: