Spot Welder using Mosfet and Lead Acid Battery
I will be designing a Spot welder for Li-ion Battery using IRLB4132 mosfet and 555 timer ic and a 12v 7Ah lead acid battery for the high current source
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Anshuman Tripathy
Tier 4
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Anshuman Tripathy
submitted Spot Welder using Mosfet and Lead Acid Battery for review ago
Anshuman Tripathy
added to the journal ago
Completed Routing the PCB
So i completed routhing the pcb.
i will be using the metal tab of the mosfet as the drain and will be screwing it on the pcb for max current.
also i have made the GND trail to be unmasked since i need to tin i even more to allow more current.
it was great learning oppurtunity for me since i didnt know how to create unmasked bare portions in Kicad so it took more time than usual
Anshuman Tripathy
added to the journal ago
Completed Research and Schematic
so i thought about making a small spot welding to make a battery pack using 18650 batteries. I did some research and figured that it could be done using a lead acid battery since they have a short circuit current of over 500A which is more than enough for welding nickel strips.
so I looked at some existing circuit and decided to use ne555 ic to deliver the short pulses high current and irlb4132 power mosfets.
here is the schematic
Anshuman Tripathy
started Spot Welder using Mosfet and Lead Acid Battery ago
1/23/2026 - Completed Research and Schematic
so i thought about making a small spot welding to make a battery pack using 18650 batteries. I did some research and figured that it could be done using a lead acid battery since they have a short circuit current of over 500A which is more than enough for welding nickel strips.
so I looked at some existing circuit and decided to use ne555 ic to deliver the short pulses high current and irlb4132 power mosfets.
here is the schematic
1/24/2026 - Completed Routing the PCB
So i completed routhing the pcb.
i will be using the metal tab of the mosfet as the drain and will be screwing it on the pcb for max current.
also i have made the GND trail to be unmasked since i need to tin i even more to allow more current.
it was great learning oppurtunity for me since i didnt know how to create unmasked bare portions in Kicad so it took more time than usual