2 reasons why the tip of the soldering iron does not eat up the tin
1. Cheap internal heating low-power soldering iron
The tip of this internally heated soldering iron is made of copper and does not have a constant temperature function, nor can it adjust the temperature.
After this kind of electric soldering iron is energized for a period of time, the temperature of the soldering iron tip will become higher and higher. Under high temperatures, the copper soldering iron tip is prone to oxidation and blackening. Even if the soldering iron tip is polished with sandpaper or a file, it will still oxidize and turn black after a short time.
If it is true that the use of a cheap soldering iron has caused the soldering iron tip to become oxidized and blackened, it is recommended to replace the soldering iron. It is best to use a constant temperature soldering iron or an adjustable temperature soldering iron. For example, the tip of the 936 temperature-adjustable soldering iron can be replaced and comes in a variety of shapes, which can be selected according to the welding needs. This kind of soldering iron head is made of alloy material and is not easily oxidized at high temperatures. As long as the soldering iron head is not corroded by acidic flux and does not need to be heated with hot melt glue or plastic, the soldering iron head can be easily tinned.
2. Use acidic flux or the solder wire contains too many impurities
Many novice welders prefer to use acidic solder paste as flux when welding. This flux is slightly acidic and corrosive to some inferior soldering iron tips.
It is recommended to use block rosin or rosin alcohol solution as flux when soldering.
In addition, cheap solder wire contains a lot of impurities, and using this kind of solder wire will also cause the soldering iron tip to not eat tin.
This kind of solder wire has poor wettability and fluidity after melting, and the solder joints are dark, not smooth and bright. If the soldering iron tip does not absorb tin due to poor solder wire quality, it is recommended to use good quality low melting point solder wire when welding.
