Reasons why soldering iron fails to tin properly
1. The power of the soldering iron is too high
The power of the soldering iron tip ranges from 20W, 25W, to several hundred watts. The manufacturing process of external heating electric soldering iron is complex, inefficient, and expensive, while the rapid heating type is difficult to operate due to the large transformer in hand; Internal heating electric soldering iron has a simple structure, high thermal efficiency, and is lightweight and flexible, making it the preferred choice. Used for decorating transistors, IC recorders, televisions, and conducting regular circuit experiments, it is generally recommended to use 20W. For repairing vacuum tube machines such as gallbladder machines and old instruments, 35W is suitable, while 45W is suitable for external heating. For soldering large transformers and grounding wires on metal substrates, internal heating 50W and external heating 75W are used. You can compare whether the power of the soldering iron tip you use is too high.
2. Poor quality of soldering iron tip
There are some inferior soldering iron tips on the market, and if you accidentally buy them, it is easy to have the problem of soldering iron tips hanging.
terms of settlement:
Prepare a blade and new solder wire first, which should contain auxiliary agents. First, heat up the soldering iron, then remove it, use a blade to scrape the area to be soldered clean, and use a new soldering wire to fill the tin on top. At first, it may still not be able to be soldered on, so scrape it clean and reapply. When the temperature drops to a suitable level, the soldering iron will naturally be soldered on. If it still doesn't work, repeat this process. If it really doesn't work, then your soldering iron tip contains too much tin and cannot be soldered. Try using a magnet to find out.
3. Long term dry burning of electric soldering iron
Electric soldering iron is not used for a long time, using inferior solder and rosin, or not hanging tin to protect the soldering head before long-term storage, resulting in the detachment of the tin layer on the soldering head of the electric soldering iron, causing the soldering head to not hang tin.
terms of settlement:
(1) Remove the power supply and with the soldering iron cooled down, remove the soldering head (note: gently remove and do not bend the heating rod). Grind off the black non hanging tin layer on the prepared 1000 grit sandpaper. Of course, if sandpaper is not readily available, the fine sand surface of a household sharpening stone can also be polished.
(2) Install the copper colored soldering head on the soldering iron and plug it into the power supply.
(3) When the soldering iron tip is gradually heated up (be careful not to touch the soldering head with rosin or absorbent sponge at this time), touch the soldering head with rosin core solder wire. From not melting at the beginning, to the gradual increase in soldering head temperature, the solder wire gradually begins to melt. At this point, after touching the entire copper colored surface of the soldering head with the solder wire, the solder can be hung properly.
(4) Coat the soldering head with rosin and it is ready for use.
