Reasons for using rosin during soldering with electric soldering iron
Rosin, a type of soldering flux.
1. The soldering iron tip is not stained with tin, and after being stained with rosin, it is easy to melt the tin and stick it to the soldering iron.
2. The reason why the tin wire is made very thin is because it needs to be easy to melt, dipped in rosin, and melted into a round and full droplet shape, rather than running around.
3. Solder drops directly onto the solder joint. If the solder joint is not cleaned or oxidized, it is easy to come into contact and fall off easily. Adding rosin helps to remove the negative effect of oxidation, making the solder stronger.
4. Without solder, when the soldering iron is removed from the solder joint, it is easy for the solder to stick, resulting in unsightly solder joints.
5. Dropping directly onto it indicates that the welding process does not require high requirements or that too much dripping has caused unnecessary waste.
Rosin is a strong reducing agent that can reduce aluminum trioxide and tin lead oxide (both of which have two corresponding valence states), generating corresponding metals and welding slag. Normally, it should not be contaminated with solder.
The soldering iron head does not occupy tin, while the 60 tin to 40 lead solder has a higher melting point, and the thermal conductivity of both metal oxides and organic oxides generated by rosin oxidation is poor. As soon as the tin wire melts, it cannot continue to receive heat and cannot flow down into balls.
I don't know what to solder, intentionally oxidizing the back of the soldering iron head to keep the front side eating tin and finally dripping is a good way. The tin wire is very thin, and the quality of the thinnest part of the tin wire is poor, with extremely poor flowability, and it cannot form clusters and drip. It is recommended to replace it. The slag tin and waste incense cannot be soldered at all.
Finally, after the tin ball drops onto the metal surface, there is no time for solid-liquid fusion, and the contact surface is loose and unstable, making it extremely prone to false soldering.
It is recommended to use an air gun or the methods mentioned above.
