You can add OPTIONAL:
There is some easy soldering required to finsih this product. All pcb files, part list, Arduino code... can be found at my Github page. More detailed information can also be found at the instructables and in the video.
Improvements in the V2:
An Arduino Nano based Spot Welder for battery welding
This Spot Welder can be used to weld 18650 batteries. It needs a 7-12V power source (12V recommended) and uses a 12V car battery as welding current supply. Typically one 45Ah battery delivers enough current to get good welds with 0.15mm nickel strips. For thicker nickel strips maybe you will need bigger battery or two in paralell.
The Welder generates a double pulse, where the first one is 1/8 of the time of the second one. Pulse time of second pulse is adjustable by the potentiometer and displayed on the screen in mS so you can exactly adjust the time. Its adjustable from 1 ... 20 mS.
There are some other welders available, but they either use ac power for welding or are to complicated for diy or are very expensive to make. So i decided to make my own design.
Its a relatively simple design an easy to make. It is safe to use because no high or ac voltages are used.
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I'm a RC enthusiast and maker who loves to build and invent new things.