The issue I have with “cheap” spot welders is the fact that there’s a micro switch under the handle you squeeze that turns it on. So it’s on as long as you’re squeezing the issue arises as the well puddle is still molten when you release and the weld pulls apart.
I had one of them and was very unhappy with the quality.
I know the USA weld quick spot II welder is $$$ but it has been amazing. It allows you to set the amount of heat and the duration. So you squeeze the handle, which starts it and the timer shuts it off while you’re still squeezing the panel together so when you release it is cooled already. It also seems to have more squeeze force than the cheapie ones.I also purchased several of the different tongs. Oh and the one I have is 220 V I just made an extension cord and I can go anywhere with it.
https://usaweld.com/products/quick_s...XGIiFv76FcJ0Wa