Simple spot welder

In amateur radio practice contact welding is not often used, but it still happens. And when such a case comes, but there is no desire or time to make a good and large apparatus for spot welding. Yes, and if you do it, then it will roll around without cause, since the next application may not occur. For example, you need to connect several batteries in a chain. They are connected by a thin metal tape, without soldering by solder, since batteries generally do not recommend soldering. For such purposes, I will show you how to assemble a simple apparatus for a spot contact weld with your own hands for 30 minutes.
  • We need an AC transformer with a secondary voltage of 15-25 Volts. Load capacity does not matter.
  • Capacitors. I took 2200 uF - 4 pieces. More is possible, depending on the power you need.
  • Any button.
  • Wires.
  • Copper wire.
  • Diode assembly for straightening.You can also use one diode for half-wave straightening.

The circuit of the device for resistance spot welding

Simple spot welding machine
The device is very easy to operate. When you press a button that is installed on the welding plug, capacitors are charged up to 30 V. After that, a potential appears on the welding plug, since the capacitors are connected in parallel with the plug. In order to weld metals we connect them and press them with a fork. When a contact closes, a short circuit occurs, causing sparks to jump and metals welded together.
Simple spot welding machine

Welding machine assembly

Simple spot welding machine
Simple device for spot welding
Solder the capacitors to each other. Make a welding plug. To do this, take two pieces of thick copper wire. And we solder to the wires, we isolate the places of soldering with electrical tape. The case of the plug will be an aluminum tube with a plastic plug through which the welding leads will stick out.In order for the output not to fail, we put them on the glue.
Simple spot welding machine
Simple spot welding machine
Simple spot welding machine
Also we put a blank on the glue.
Simple spot welding machine
Simple spot welder
Solder the wires to the button and apply the button to the plug. We cover everything with tape.
Simple spot welding machine
A simple apparatus for spot welding
That is, four wires go to the welding fork: two for welding electrodes and two for the button. We assemble the device, solder the plug and button. Simple spot welding machine
Turn on, press the charge button. Capacitors are charging.
Simple spot welding machine
We measure the voltage on capacitors.It is approximately equal to 30 V, which is quite acceptable. Try to weld metals. In principle, it is tolerable, given the fact that I took not quite new capacitors. The tape holds up pretty well.
A simple spot welding machine
A simple spot welding machineSimple spot welding machine
Simple spot welding machine
Simple spot welding machine
Simple Spot Welding Machine
But if you need more help, then you can refine the scheme like this. Simple spot welding machine The first thing that catches your eye is the larger number of capacitors, which significantly increases the power of the whole device. Next, instead of a button - a 10-100 resistor Ohm I decided that it was enough to indulge with the button - everything charges itself in 1-2 seconds. Plus, the button does not stick. After all, the instantaneous charge current is also decent. And the third one is a choke in the fork circuit, consisting of 30-100 turns of thick wire on a ferrite core.Thanks to this throttle, the instantaneous welding time will be increased, which will increase its quality, and the life of capacitors will be prolonged.Simple spot welding machine Condensers operating in such a contact welding machine are doomed to an early failure, since such overloads are not desirable for them. But they are more than enough for several hundred welding joints.

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