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Showcasing our spot welder, which is controlled by an Arduino Nano.

In this project, my father and I are taking a shot to improve our own spot welder, which we started around two years ago. It might not be a hot topic on this website, but we had fun making it and learned a lot our of it. We hope you do as well.

What I am covering in this project
I will only cover the Arduino part of the welder, which is simple and does its job quite well, as well as give some basic specs of the welder itself. There are many turorials on YouTube and electronics forums that cover the making process of a welder and that’s how we learned as well.

What is a spot welder?
It’s a device that forces a large current to a small spot between metals, thus meting them and joining them together, from the heat that is generated. This process lasts some mere milliseconds (depending on the metals that we’re welding) and requires the device to be highly powered, which is the main feature of a spot welder: Delivering high power in a very short time.

To deliver this current, copper alloy electrodes are used.

How to decide how much time this process will last?
In my opinion, there is no standard when it comes to welding time. Me and my father, only use our experience to decide how many milliseconds are enough for a good welding, although, this time can be calculated easily, given the power of the welder and the thickness of the metals we are about to join together.”

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