Welding from a pencil

Miniature welding of metal conductors or small parts can be done with a regular pencil rod. A mini welding machine with a graphite rod can not only weld, but also cut metals of small thickness.
How to apply it and for what, I think, you will decide for yourself.

Will need

• A step-down transformer.
  
• A simple pencil.
  
• Wires.
  
• Alligator clip.
  

Preparation

For a miniature welding machine you will need a transformer with an output voltage of 27 V. Its power is somewhere around 50-60 W. You can take any other transformer with similar characteristics, or use ready-made sources with adjustable voltage.

Simple pencil. It must be carefully cut along the gluing without damaging the inner rod.

We make improvised terminals. A crocodile for the general wire, and a homemade wire hook for the electrode.

We fix the graphite rod into the holder. We solder the wires to the transformer.

Metal welding

Before you start welding anything, take care of safety precautions. Be sure to use safety glasses and do not touch live parts. You do all actions only at your own peril and risk, so be vigilant and careful.
For welding, prepare a fire-resistant surface: a brick, a piece of stone or tile, etc.
Let's get started. We will weld two copper wires. We connect the common one to the wires being welded, and touch the electrode to the surface to be welded.
Initially, the arc does not ignite and the lead smokes. This is normal for initial startup.

After just a couple of seconds, the rod warms up enough and the voltage and temperature are quite enough to ignite the arc.

We continue welding. The main thing here is not to burn the rod, as it heats up to redness and breaks. Therefore, we periodically remove it by breaking the arc to allow it to cool slightly.

As a result, the copper conductors are perfectly welded.

They cannot be torn apart, since the knot has become one whole.

There is definitely a place to use this useful property on the farm.

Metal cutting

Just like a real welder, this mini model can not only weld, but also cut metal.
But for this you will have to increase both the temperature and the current. This can be achieved by reducing the length of the electrode.
As a result, the temperature will rise sharply. Cut off the self-tapping screw.

Of course it took a little more time, but everything was cut well.

This is a big plus craftsthat no expensive materials are used, and it only takes five minutes to assemble everything.
Do not underestimate the advantages of such a device; in some cases it can definitely come in handy.

Watch the video

Watch a more detailed video.