Two reasons why soldering iron heads do not eat tin
1. Cheap internally heated low-power electric soldering iron
The soldering head of this internally heated electric soldering iron is made of copper, does not have a constant temperature function, and cannot be adjusted.
After this type of electric soldering iron is electrified for a period of time, the temperature of the soldering iron head will become higher and higher, and at high temperatures, the copper soldering iron head is prone to oxidation and blackening. That is, if the soldering iron head is polished with sandpaper or a file, it will still oxidize and blacken after a short time.
If it is indeed the use of cheap electric soldering iron that causes oxidation and blackening of the soldering iron head and does not eat tin, it is recommended to replace the electric soldering iron, preferably using a constant temperature soldering iron or an adjustable temperature soldering iron. For example, the soldering head of the 936 adjustable temperature electric soldering iron can be replaced, with various shapes that can be selected according to welding needs. This soldering head is made of alloy material, which is not easy to be oxidized at high temperature. As long as the soldering head is not corroded by acid flux and does not use the soldering head to burn Hot-melt adhesive and plastic, it is easy to tin the soldering head.
2. Use acidic flux or solder wire with too many impurities
Many novice welders prefer to use acidic solder paste as a flux when welding. This flux is slightly acidic and can corrode some low-quality soldering iron tips.
It is recommended to use blocky rosin or rosin alcohol solution as soldering flux during welding.
In addition, cheap soldering wire contains a lot of impurities, and using this soldering wire can also cause the soldering iron head to not eat tin.
This type of solder wire has poor wettability and fluidity after melting, and the solder joints are dark, not smooth and bright. If the poor quality of the soldering wire causes the soldering iron head to not eat tin, it is recommended to use high-quality low melting spot welding wire during welding.
