Y Hello everyone.
It’s time for Soldering News, bringing you the truth about soldering. I, Yanaka, will be your host.

This time, following our previous theme of “Heating,” we will discuss an important element in soldering, the solder itself, and specifically, the “Flux” contained within it.

Y Flux has two important effects. The first is Cleaning. The second is the reduction of surface tension. First, let’s take a look at a video about cleaning. Please watch.

This is an oxidized copper plate that has turned black on the surface. When you apply flux and wipe it off, you can see how the surface becomes clean. This is the cleaning effect of flux.

We have just watched the video about the cleaning effect. The removal of the oxide film from the metal surface is essential for soldering, as solder does not adhere to surfaces with oxide films.

Y In the next video, we will see the important effect of reducing surface tension for spreading solder. Please watch.

Here, we are using thread solder that does not contain flux. Without flux, it has such viscosity. When we apply flux and add heat again, the solder spreads out like this. The surface becomes shiny and clean.

You have just watched the video about the reduction of surface tension. The difference before and after the application of flux was clearly visible. This is precisely the effect of reducing surface tension.

Y From the two videos presented, I hope you have understood how important flux is to soldering. Our channel will continue to bring you the truth about soldering.

See you in the next video. Goodbye.