Multi Projects : How To Make Spot Welding Machine

Welcome to Multi-Projects, in this video I'm going to make powerful and budget-friendly spot welding machine. Spot welders are essential for welding thin metal sheets, battery tabs, and other metal components. By repurposing an old microwave transformer, we can create a high-current, low-voltage power supply perfect for spot welding.

This machine is properly designed according to the working requirements.

Materials Required:

Old microwave oven transformer

Thick copper wire 25 mm (for secondary winding)

Insulated wire and connectors

Welding electrodes (copper rods )

push witch (door bell push button)

on/off switch.

Indicator Led light.

piece of wood for housing.

PVC pipe for body.

DC power supply ( how to make DC power supply https://youtu.be/43mE8H05ikM ).

PC cooling fan.

Safety gloves and goggles.

Steps to Build:

Disassemble the Transformer – Carefully remove the from an old microwave. Use a hacksaw or cut off the secondary coil (thin wire) while keeping the primary coil intact.

Rewind the Secondary Coil – Replace the removed coil with thick copper insulated 25mm wire to allow for high current output. Wrap 2 turns around the core.

Build the Electrode Holder. Attach tin coated copper thimbles and connect copper rods to the output terminals, (act as welding electrodes).

Ensure they are securely fixed for good conductivity.

Assemble the Circuit – circut diagram link

Testing and Calibration

Test the welder with scrap metal, adjusting pressure and timing to achieve strong welds.

cooling fan safety grill of welding plant made with this welding machine.

machine is tested with veries materials show impressive results.

Safety Precautions:

Always wear protective gloves and goggles.

Ensure proper insulation to avoid short circuits.

Use a grounded power connection to prevent electrical hazards.

This DIY spot welding machine is perfect for any type thin and thick sheet metal welding, and small repair jobs.