Why is the soldering wire of an electric soldering iron not sticky
Electric soldering irons are mainly composed of a handle, power cord, heating core, soldering iron head, and mica sheet (some precision ones also have various temperature control circuits). According to their heating methods, they can be divided into two categories: internally heated electric soldering irons and externally heated electric soldering irons, which correspond to different usage scenarios. The reason why it is called an internally heated electric soldering iron is because the soldering head of the internally heated electric soldering iron is hollow, and its heating core is located in the internal hollow of the soldering head, so it is called an internally heated electric soldering iron.
Internally heated electric soldering iron head with a hollow structure on the last side
The external heating electric soldering iron head is exactly the opposite of the internal heating electric soldering iron. The iron head of the external heating electric soldering iron is solid and generally made of red copper material. The heating core of an externally heated electric soldering iron directly wraps around the soldering iron head, meaning that the soldering iron head is inserted inside the heating core, hence it is called an externally heated electric soldering iron.
Externally heated electric soldering iron tip, solid structure
Whether it is an internally heated electric soldering iron or an externally heated electric soldering iron, their working principle is the same. The power plug of the electric soldering iron introduces household AC220V AC power to both ends of the heating core, which is energized and generates heat.
A small portion of the heat emitted by the heating core is dissipated into the surrounding air, and most of the heat is still exported to the soldering iron head. The temperature of the soldering iron head can reach 200-450 degrees, which can then melt the solder for welding.
Why does an electric soldering iron not stick solder
1. Electric soldering iron has been in use for a long time, and the internal heating core is aged or damaged, resulting in heat not reaching the melting point of the soldering tin, resulting in the soldering iron head not sticking to the soldering tin.
2. During daily use, the electric soldering iron is not tinned after use, resulting in oxidation of the soldering iron head with air at high temperatures.
Oxidized and blackened soldering iron tip
3. After using the electric soldering iron, the power supply was not cut off in a timely manner. The soldering iron is in a high-temperature state for a long time, which oxidizes with air, resulting in non sticking solder.
4. In order to pursue convenience in daily welding, acidic flux is used, which oxidizes the soldering iron head under high temperature conditions.
5. The problem with the soldering iron head itself is the use of some soldering iron heads with poor materials, such as some soldering iron heads that are directly made of iron, which are prone to oxidation.
How to solve the problem of soldering iron head not sticking to soldering tin
1. Prepare high-quality soldering tin, rosin, and high-temperature sponge. Turn on the electric soldering iron and wait for its temperature to rise. Insert the soldering iron tip into the rosin and shake it back and forth. Then take out the prepared solder and melt it in contact with the soldering iron tip.
2. If the soldering iron head has oxidized and turned black, you can prepare a file (if there is no file, it is also possible to prepare sandpaper). Use a file or sandpaper to polish the soldering iron head and remove the black oxide layer on the surface of the soldering iron head.
