[Aaron Christophel] has a battery spot welder that costs a not unreasonable 30 euros and can also be used as a novelty power bank. He subjects it to a test and teardown in the video below the break.
The spot welder [Erwin] used is the work of a user by the name of [aulakiria] (link is Korean, machine translation here) and is designed to be portable and powered by batteries commonly used for RC.
Tools that fall into the former category and go a few steps beyond the average drill or sander are stud and spot welders, which Harbor Freight has a few of to consider. It's known that Harbor ...
The joining action is achieved by the small pools of molten metal which form as a result of heat buildup due to resistance. These welding systems can be classified as spot welders or seam welders, ...
Spot diameters of about 1 mm are realistic ... If this trend continues, modern laser welding machines are set to capture even more of the market for plastic welding.