What to Do When the Solder Won't Come off the Soldering Iron Tip
When we are using the soldering iron tip, the solder may don't fall off but instead forms a lump attached on the tip. If we do not dealt with it , it will affect the efficiency of the electric soldering iron. Today, let's take a look at how to handle this together.
It is usually caused by the long-term heating of the soldering iron tip and oxidized in the air. The solution is: use sandpaper to polish it first before it is heated. So that the newly metal color is exposed on the surface (scraping with a blade is also okay). Then turn on the power and try to melt the rosin (don't use solder paste)gradually, and then touch the solder wire. As the temperature keeps rising, a layer of solder will be plated on the soldering iron tip (isolating the soldering iron tip from the air). In this way, the soldering iron tip won't be "burned out" in the future. Pay attention to do regular maintenance. After finishing soldering, wipe the soldering iron tip clean with a dry cotton cloth while it's still hot, leaving no debris, and make sure there is always a layer of solder on the tip.
The following operations can also prevent the solder from not coming off the soldering iron tip:
1. The connection between the circuit board and the mouse cable has fallen off due to too many insertions and removals, and it still won't solder onto the circuit board. It requires a large solder bead to attach to the board, and then it connects to the adjacent solder joints. If it's not burned out, the extra solder can be removed and then resoldered.
2. Use a desoldering pump to remove the extra solder. Don't set the temperature of the soldering iron too high. If it's not easy to solder, apply enough flux (rosin). When soldering, touch it slightly sideways and don't stay for too long.
3. If the solder pad is oxidized, scrape it with a small knife, then clean it with alcohol, and try soldering again. The solder added rosin can be soldered onto the pad instantly. But ordinary solder is really a little difficult to solder and requires a relatively high temperature to melt . Sharpen the soldering iron tip a bit, let it heat up for a while, and then put it on to make the solder joints smaller.
4. If the temperature is not enough, leave the soldering iron tip on for a longer time. Don't use rosin. The soldering iron tip should heat the copper pad on the board at first, otherwise, the solder won't stick.
5.The surface temperature of the circuit board should be able to melt the solder. And the metal surface must be exposed. So when soldering, the surface should be cleaned first to let the real material expose. Heating should be done quickly, otherwise, the treated surface will be oxidized again.
6. The function of the flux (rosin) is to help clean the metal surface and isolate the air during welding. However, it will become impurities when the flux is heated over time,which will hinder the welding task.
