The easiest way to solder aluminum wires without special fluxes

If you have ever had the need to solder aluminum wires together or with a copper wire, then you know very well that you can’t just do it. Due to the instantaneous formation of a persistent oxide film, it is almost impossible to solder aluminum with a regular flux, but there is one simple life hack on how this can still be done without a special flux.

Needed for soldering

For soldering you only need three things:

Sandpaper.
Solder with a core of rosin inside (or regular solder with a separate rosin) - http://alii.pub/5l1kkw
Any mineral engine oil (synthetic will also work).

We solder aluminum wires at home without special flux

We clean the aluminum parts at the soldering point using sandpaper. In this case, we remove the varnish insulation at the same time.

The sandpaper will make micro-scratches at the soldering site, which will contribute to its reliability.
Dip the tip of the wire into oil.

We tin with a well-heated soldering iron. Just not overheated, but heated up, otherwise the oil will quickly evaporate, and it acts as a flux and prevents oxygen from getting into the center of the soldering.

The secret is that during tinning you need to scrape the wire with a soldering iron tip. This will remove the oxide film and allow the solder to stick to the aluminum.