The soldering iron always fails to stick to the wire joints when welding them
I am not a professional repairman. Sometimes when an electrical appliance breaks down at home, I want to repair it myself. However, when I use a soldering iron to solder the wire joints, it always fails to stick. The solder either sticks to the soldering iron or falls off, or does not stick to the wires. I also use solder paste. Got it or not.
During use, the soldering iron often fails to stick to the solder or even melts the solder. At this time, the head of the soldering iron you see must turn black. This situation indicates that the soldering iron head has been oxidized, commonly known as being "burned to death". . In this case, do not use a knife to scrape or file to avoid damaging the alloy layer at the tip of the soldering iron tip (tip). It must be treated in the correct way before it can continue to be used. The following two solutions work well.
One of the solutions: wipe
Find a high-temperature-resistant, rough cleaning sponge that swells when exposed to water (the kind used for women's facial care, or buy it at the electronics mall tool counter) as shown below, soak it in water, wait for it to expand instantly, pinch off part of the water, and then Rub the heated soldering iron tip on it one at a time, and at the same time, rub the rosin-containing solder wire onto the soldering iron tip. Repeat this process until the soldering iron tip is shiny and tin-plated.
Solution two: rub
With a little force, rub the heated soldering iron tip repeatedly on the lump of solder formed by the melted solder wire. In the meantime, from time to time, melt the soldering iron tip on the rosin block that can help welding and decontamination and coat it with rosin. Repeat the above actions many times, and the soldering iron tip will be as bright as new and very easy to use.
After the above operations, if the problem is not solved, then you need to doubt the quality of the soldering iron tip and solder wire. There are many fake and shoddy products in the former, while the latter contains very little tin. After melting, it looks like tofu dregs and the solder joints are dark. Both are sold at low prices and are passed off as inferior products.
1. The temperature of the soldering iron is between 320 and 420 degrees. If the soldering iron head is oxidized, turn off the power and use a knife or sandpaper to remove the oxide.
2. Why aren’t the wire connectors tinned? The normal situation is that if the household appliance is broken and you have used it for a long time, the connector at the wire end will have current passing through and external dust entering during long-term use, causing aging, oxidation, and dust on the wire end, so you have to weld it. Went up.
3. Normal welding is when the temperature of the soldering iron is about 380 degrees. If the temperature of the welding wire is a little higher, there is no problem. Is the soldering iron tip oxidized? If the above problems have been solved, mainly check that some of your wires are enameled wires, which need to be scraped off with a knife. The outer layer of the enameled wire is conductive insulating paint, and then a little tin on the wire can be firmly welded.
4. When the electric soldering iron does not need to be turned off, please put a little tin on the tip of the electric soldering iron so as not to fall off. This will prevent the tip of the electric soldering iron from oxidizing. This will make it easier for you to use next time. Finally, I would like to emphasize that it is a good thing to do it yourself, but you must ensure safety first!
