Electric soldering iron always doesn't stick to wire joints
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 weld wire joints, it always doesn't stick. The solder either sticks to the soldering iron or falls off, or doesn't stick to the wires. Even if I use solder paste, it still doesn't stick.
During the use of electric soldering irons, there is often a phenomenon where they do not touch or even cannot melt the soldering tin. At this time, the head of the electric soldering iron you see must be black, indicating that the soldering iron head has been oxidized, commonly known as "burned to death". In this situation, do not use a knife to scrape or file, to avoid damaging the alloy layer at the tip of the soldering iron (tip). It must be treated correctly before continuing to use. The following two solutions are effective.
One solution: wipe
Find a high temperature resistant, rough cleaning sponge that swells when exposed to water as shown in the following figure (such as women's facial care and facial grinding, or purchase it at the tool counter of an electronic mall), soak it in water, wait for it to expand instantly, pinch off some of the moisture, and then wipe the heated electric soldering iron head on it one by one. At the same time, rub the soldering wire containing rosin onto the soldering iron head, and repeat this process until the soldering iron hair is bright and tin coated.
Solution 2: Rubbing
Apply a slight amount of force and repeatedly rub the heated electric soldering iron tip against the block of solder wire formed by melting. During this time, occasionally dissolve the soldering iron head on a rosin block that can assist in soldering and cleaning, and coat it with rosin. Repeat the above steps multiple times, and the soldering iron head will be as shiny as new and very useful.
After the above operation, if the problem has not been solved, then it is necessary to suspect the quality of the soldering iron head and soldering wire. 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 shoddy.
1. If the temperature of the electric soldering iron is between 320-420 degrees Celsius and the soldering iron tip is oxidized, turn off the power and use a knife or sandpaper to remove the oxide.
2. Why is the wire joint not soldered? The normal situation is that the household appliance is broken and you may have been using it for a long time. During prolonged use, there may be current passing through the connector of the wire head and external dust entering, resulting in aging, oxidation, and dust on the wire head, so you welded it on.
3. Normal welding involves using 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 head slightly, and whether the soldering iron head is oxidized. If all the above issues have been solved, the main thing to check is that some of your wire heads 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 a little tin on the wire head can be firmly welded.
4. When the electric soldering iron does not need to be turned off, please put a little tin on the head of the soldering iron and do not remove it to prevent oxidation of the soldering iron tip. This way, you will be able to handle it the next time you use it. Finally, it should be emphasized that doing it yourself is a good thing, but safety must be guaranteed first!
