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.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.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.Also we put a blank on the glue.Solder the wires to the button and apply the button to the plug. We cover everything with tape.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.Turn on, press the charge button. Capacitors are charging.
- 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.
- 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
Welding machine assembly
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