Cheap Spot Welder Circuit. Firstly check out how to make the Metal. There are a plethora of welders out there on eBay and Aliexpress just search for battery spot welders.
Other materials included scrap 26 22 two copper screw type lugs two copper welding cable lugs two MIG welder. Here is a step-by-step tutorial on how to make an 800 amp Spot Welder from common materials and for dirt cheap. The welder currently operates at 28 Volts.
They are most likely used in the auto industry as well as HVAC for welding metal ducting.
Typically one 40Ah 440A battery delivers enough current to get good welds with. An Arduino Nano based Spot Welder for battery welding. When power is connected This DC Power source charges the capacitor if the switch is pressed it activates the Relay 1 and charge of capacitor activates the Relay 2 Since capacitor can hold very few amounts of energy it quickly discharges and Relay 2 turns off. Interesting use of recycled materials the only problem is that there is no overcurrent protection fuse or circuit breaker which could be a dangerous condition in terms of electrodes welding to one another or otherwise resulting in a constant-on and potential for melt down of components.
