December 8, 2022


Empowering People

Hackaday Prize 2022: A Not-So-Smart Spot Welder

An exploded diagram of the spot welder. Shown are the capacitor bank, trigger, 12 V relay, DC power input, power out, step up converter, voltmeter, industrial SCR module, and capacitor bank.

Do-it-yourself spot welders normally use large-run components that can be a bit horrifying, given the potential for harmful malfunctions. [Wojciech “Adalbert” J.] intended his capacitive discharge spot welder to be safe, uncomplicated to construct, and forego the microcontroller.

Quite a few jobs function good with just a solitary Li-ion cell, but when you need more electric power, you’ve received to begin connecting more cells alongside one another into a battery. [Wojciech]’s spot welder is made to be just potent sufficient to weld nickel tabs onto a mobile without the need of any overkill. The capacitor financial institution utilizes nineteen Nichicon UBY 7500uF/35V capacitors, all wired in parallel using solder wick saturated with solder. They sit atop on a perfboard with metallicized holes to have the high existing.

[Wojciech] has in depth every stage of developing the welder, such as improvements to the off-the-shelf relay board and incorporating a potentiometer to the stage-up converter board. The amount of element would make this seem to be like a excellent starting location if you are hoping to hop into the earth of Diy spot welders. Harmless is usually a relative phrase when working with large driven units, so be very careful if you do endeavor this construct!

Diy location welders have graced these digital web pages many instances, which include this one developed with security in mind, and this other a person that was decidedly not.