Homemade spot welding machine
This is a DIY spot welding machine that will be used for future projects with lithium batteries, this is a project that was already midway through when I decided to publish
Created by
housey2k
1 view
0 followers
housey2k
added to the journal ago
Spot welding machine build
The first step to building this machine was choosing the components, i quickly found on aliexpress a board that could do the job perfectly, the NY-D01, a control board that is really cheap and meant for spot welding.
We need to power it with a 9V AC transformer, the reason to use a transformer instead of DC power supply is that the board watches the AC signal to keep sync with the grid. this allows the adjusts to work properly, and to avoid power surges by switching the output at the AC peak for example.
It comes with a potentiometer for time and a potentiometer for duty, below there are images that make it easier to understand what each do:
Time adjust, this one changes number of cycles:
Duty adjust, this one crops part of the waveform, that results in less average power:
Here is how my machine looks like:
Now the next step, that I'll be publishing in more detail, is the purchase and modification of the transformer, for this project I'll be using a MOT (Microwave Oven Transformer) because it's really easy to acquire, can take a lot of power, and many other people had success using the same kind of transformer.
The wooden box that I'm using was salvaged from some junk. the pedal, wiring and power connector also came from trashed electronics I have laying around, the only components I bought are the control boards and soon the MOT.
housey2k
started Homemade spot welding machine ago
12/28/2025 - Spot welding machine build
The first step to building this machine was choosing the components, i quickly found on aliexpress a board that could do the job perfectly, the NY-D01, a control board that is really cheap and meant for spot welding.
We need to power it with a 9V AC transformer, the reason to use a transformer instead of DC power supply is that the board watches the AC signal to keep sync with the grid. this allows the adjusts to work properly, and to avoid power surges by switching the output at the AC peak for example.
It comes with a potentiometer for time and a potentiometer for duty, below there are images that make it easier to understand what each do:
Time adjust, this one changes number of cycles:
Duty adjust, this one crops part of the waveform, that results in less average power:
Here is how my machine looks like:
Now the next step, that I'll be publishing in more detail, is the purchase and modification of the transformer, for this project I'll be using a MOT (Microwave Oven Transformer) because it's really easy to acquire, can take a lot of power, and many other people had success using the same kind of transformer.
The wooden box that I'm using was salvaged from some junk. the pedal, wiring and power connector also came from trashed electronics I have laying around, the only components I bought are the control boards and soon the MOT.