“Nowadays it is very common to use batteries on makers projects. The propose of the project is to be able to solder easily on lithium batteries without using battery case holders. This cool solution allows to build a small and cheap spot welding machine. Spot welders based on capacitors use large capacitors to store electrical energy and release it quickly. Capacitors can deliver large current peaks extremely fast. The capacitors discharge energy is dissipated due to the metal resistance in the form of heat which melts and fuses metal pieces. A large current passes through the work piece and weld nugget is formed in few milliseconds.”
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