Due to many requests for the PCBs
I do currently have some PCB Sets and prebuilt kits in stock. Take a look here:
You can also take a look in the comments below this instructable. Some people who ordered boards at PCB manufactures are willing to sell some of them.
The Spot Welder has a new PCB layout ! 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.
Watch the Video to get detailed instructions on how to build it.
Project Files: (BOM, pcb files, aluminum template, arduino code...)
You can find the Eagle / KiCad files for the PCBs on my Github.
Easyest way is to order the boards at an PCB manufacturer. For example at pcbway.com .There you get 10 boards for about 25 €. The necessary gerber files for ordering at pcbway.com can be found in my Github.
You can support me by registering through this link http://www.pcbway.com/setinvite.aspx?inviteid=128...
This way you get a 5$ coupon for your order and i get some percent discount on orders for upcoming projects.
But if you like diy you can also build it on a prototype pcb board with hand wiring. This is how i did the first prototype of the spot welder. In the pictures you see a manufactured board looks much cleaner.
The trace that connects the two boards in the combined gerber is only a ground connection not needed for the spot welder to work. It is only there to make clear to the pcb manufacturer that this is meant as one board and they dont need to make v-cuts or something else. With this modification it is possible to order at pcbway without problems.