How to Make a Crude Spot Welder From Arduino

In this project, I will show you how to build a functional spot welder using industrial circuits and commercial parts. First, I would like to tell you what spot welder is and how it really works.

A spot welder is a device that is used to wield two metals sheet together without any filling material. It is also known as resistance wielding, where two or more metal sheets are welded together by applying pressure and heat from an electric current to the wield area. The main power source is a 6000mah battery. Ok, let's begin building the spot welder.

1. A Poudell Spot Welder V1 Pcb
2. 0.96 inch OLED displays. 
3. Rotatory encoder Module.
4. Arduino Pro mini.
5. Reisistors 10ohm, 220ohm, 1K, 10K, 4.7K, 20K
6. SS56 Schottky diode
7. 5V relays
8. Transistors
9. 3pin terminal block
10. Optocouplers.
11. Footswitch.
12. Welding electrodes.
13. 10 AWG flexible silicon wires.
14. 5000Mah or 6000Mah battery with 60C or more Discharge rating

This video will give an overall demonstration of the spot welder that we will be making. It also gives the features that are included in the spot welder, and also gives information on how to change/ select different building modes while using it. 

I hope you watch this video before beginning this project, you will have prior knowledge about this project.

This is the Circuit Diagram for this project.

The Power Circuitry regulates the high voltage from input parallel jack or battery terminals to the 5V which powers the OLED, Arduino, relays and rotatory Encoder.

External relay Switching circuitry is there so that if you don't have mosfet bank, you can actually use an automotive relay instead of a MOSFET bank. Learn to make a spot welder from an automotive relay from the link below.

There is also a relay for AC switching so with this design and PCB, you will be able to use this as a timer circuit to make a spot welder from Hacked Microwave oven Transformer.

We actually have the Mosfet bank for Battery Spot Welding. Remember, all the power MOSFETs must be of the same batch and of same number with low Rds.

we have a footswitch, rotatory encoder as the Inputs and we have a 0.96inch I2c OLED to display all the parameters.

and at the last the Arduino Pro mini microcontroller processes all the information and actually acts as the brain of the system.

Others are just passive components to support the other electronics. But hey, you don't need to bother with the circuit and PCB as I have already done this for you.

I have already done the hard work of designing the circuit diagram and the PCB. You can simply download the Gerber files and then you can send the files to PCB manufacturers like JLC PCB for Professional quality PCB at a very low cost. Let me show you how you can do this.

Gerber file:- https://drive.google.com/file/d/1LTvsKjAPXu-h3siVJTqhWbrUJ4BfJMz-/view?usp=sharing

Go the JLC PCB homepage by clicking the link:- www.jlcpcb.com

you can login with your existing google account within minutes. There you just need to upload the gerber to it and select the quantity. select the shipping address, pay the price and you will receive the PCB in 7-10 days.

After the PCB is delivered, we can start assembly of all the required components. Please check the polarity of the components before soldering them. If polarity is wrong, then you might circuit the components or damage the PCB. It is very easy to solder components if you follow and place and solder components according to shared reference design.

After assembling all the components, the first thing you need to do is download and install all the required library to run the code. The link to the library has been given inside the code.

Download Code:- https://drive.google.com/file/d/1wrAMdoMMkzvuFNPTzc2KhfO9IzgY6WoM/view?usp=sharing

If you have followed all my steps carefully, then congratulation, you just made your own battery spot wielder. 

Thank you for following my instruction. Eel free to check out my YouTube channel for more awesome projects: Amateur Inventor - YouTube

Support my works at Patreon

You can also follow me on Facebook, Instagram.