Build a 1000W Battery Spot Welder Using a Microwave Transformer | Step-by-Step Guide

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Hey! Want to make some kind of large battery pack for a project and don't want to have to purchase one of those expensive Spot welders? Well, you're at the right place! Make a DIY Spot Welding Machine for dirt cheap - next to nothing! Just grab your tools, some scrap parts, a broken microwave oven and let's build!
This 1000-Watt Spot Welding Machine produces an open-circuit voltage as low as 2.2V at 450 Amps, when welding (in short-circuit) the voltage drops to about half of that or even less with a current as high as 900-1200A.

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Circuit diagram - Spot Welding Machine:

Materials/parts needed for this project:
Microwave Oven Transformer (MOT)
Microwave Oven (AC powered) Cooling fan
15A Momentary Push switch -
15A On/off toggle switch -
10-15A Fuse -
1M of 4AWG Enameled copper welding wire (a.k.a battery wire) -
Electrical wire (12-16AWG) -
120V 3-wire cable -
3mm exposed solid copper wire (spot welder tips) -
UPS Inverter Metal cover/case (A plastic or wooden enlosure can do fine)
1x1" Square stick of wood
Retraction spring -
Mini door hinge -
(x2) Shortened bolts -
Zip ties -
PVC-foam gripped handle
Wooden "Cement Float" Handle
Spray paint -
Nickel strips for spot welding 18650-type Li-Ion batteries together -

18650 cells -

🪛🔧🔨 Tools and extra supplies I use:
➡️ Soldering Iron Kit -
➡️ Hot Glue Gun -
➡️ Drill Machine -
➡️ Box cutter/Utility knife -
➡️ X-Acto Hobby Knife -
➡️ Cutting Matt (Green) -
➡️ Needle-nose Pliers -
➡️ Wire Cutters for Electronics -
➡️ Wire-stripping tool (Automatic) -
➡️ Screwdriver kit -
➡️ Heat-shrink Tube Kit -
➡️ Jumper Wire Kit -
➡️ Breadboard for Prototyping -
➡️ Perf Boards, Pin headers, and Connectors Kit -
➡️ Superglue -
➡️ Duct Tape -
➡️ Double-sided Tape -
➡️ Kapton Tape (for battery leads) -

Music credits:
CHRIS HAYES MUSIC - CHILL TRAP BEAT | No Copyright Trap
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#spotwelder #diyspotwelder #batteryspotwelder