The soldering iron always doesn't stick to the wire joints when welding
I am not a professional repairman. Sometimes when my home appliances break down, I want to repair them myself. However, when using an electric soldering iron to solder the wire joints, it always doesn't stick. The solder either sticks to the soldering iron or falls off, or doesn't stick to the wire. Even after using solder paste, it still doesn't stick.
During the use of an electric soldering iron, there is often a phenomenon where it does not stick to or even cannot melt the solder. At this time, the head of the soldering iron you see must be black, indicating that the head has oxidized and is commonly known as "burned to death". In this situation, do not use a knife to scrape or file, to avoid damaging the alloy layer of the tip of the soldering iron. It must be processed correctly before continuing to use. The following two solutions are effective.
One solution: wipe
Find a high temperature resistant, rough cleaning sponge that swells in water as shown in the diagram below. Soak it in water for a while, and wait for it to instantly expand. Pinch off some of the moisture, then rub the heated soldering iron head on it one by one. At the same time, use a soldering wire containing rosin to rub against the soldering iron head. Repeat this process repeatedly until the soldering iron hair is shiny and tin coated.
Solution 2: Rubbing
Apply a little force and repeatedly rub the heated soldering iron tip against the block shaped solder formed by melting the solder wire. During this process, occasionally dissolve the soldering iron tip on a rosin block that can assist in welding and cleaning, and then coat it with rosin. Repeat this process multiple times, and the soldering iron tip will shine as new and be very useful.
After the above operations, if the problem has not been solved yet, then the quality of the soldering iron head and soldering wire should be suspected. The former has a lot of fake and inferior goods, while the latter has very little tin content and melts like tofu residue, with dull solder joints. Both are sold at low prices and are inferior.
1. The temperature of the soldering iron is between 320-420 degrees Celsius. Check if the soldering iron tip is oxidized. After turning off the power, use a small knife or sandpaper to remove the oxide.
2. Why is the wire joint not soldered? Under normal circumstances, if a household appliance breaks down and you have been using it for a long time, there may be current passing through the connector of the wire head and external dust entering during long-term use, resulting in aging, oxidation, and dust on the wire head. Therefore, you need to solder it on.
3. Normal welding requires an electric soldering iron with a temperature of around 380 degrees Celsius. It is not a problem to raise the temperature of the soldering wire slightly, and whether the soldering iron tip is oxidized. If all the above problems have been solved, the main thing to check is that some of your wire tips are enameled wire. You need to use a small knife to scrape off the conductive insulation paint on the outer layer of the enameled wire, and then apply a little tin to the wire tip to firmly solder it.
4. When the electric soldering iron does not need to be turned off, please put a little tin on the tip of the soldering iron and do not remove it to prevent oxidation of the soldering iron tip. This will make it easier for you to use next time. Finally, it should be emphasized that doing it yourself is a good thing, but safety must be the top priority!
