The problem and repair of the soldering iron not heating up
(1) If the soldering iron does not generate heat, you must first install the heating core of the soldering iron correctly.
After some internally heated electric soldering irons are replaced with new soldering iron cores, the temperature cannot rise even after being powered on for a long time. Can't even melt tin, and the handle is very hot. During the inspection, if the voltage is normal, you need to remove the soldering iron core and check whether the internal installation is reasonable. Because the internal heating type soldering iron core and the outer tube shell are the same length, the correct installation method is to keep the end of the soldering iron core aligned with the end of the outer tube, and not indented or protruding. Keeping the alignment can keep the heat If the soldering iron core is retracted a lot and the electric heating core is installed toward the handle, the heat will be concentrated on the handle end, and the heat on the soldering iron head will not reach the temperature of molten tin.
(2) If the soldering iron does not heat up, pay attention to the wiring of the new soldering iron core.
The author had an internally heated soldering iron core that burned out. Even after a few replacements, the lifespan was not long. After careful observation and analysis, I found that the lead of the new soldering iron core was too short. There is no room for the soldering iron core to expand and contract when it is cold or hot, causing the soldering iron core to break the internal thin resistance wire when it is cold and shrinks after unplugging the plug. The correct replacement method should be to make the lead wire a little longer, 1 to 2 mm, so that it is less likely to burn out. But at the same time, it should be prevented that the thread ends are too long, causing wire collision and short circuit faults.
(3) If the soldering iron does not generate heat, it is not advisable to use the twisting method to repair the broken heating wire.
After the hot wire or root lead of the soldering iron is disconnected, the twisting method is usually used to reconnect it. This method often causes spark fuses or thermal fuses due to loose contacts and high contact resistance. A better method is to take out the heating wire, first remove the oxide at the joint, then twist it tightly, and then put a little broken glass and electric porcelain (6:1) powder around the joint. After installation, turn on the power for a few minutes, and the powder will melt and attach to the contacts, making it less likely to fuse and more durable.
If you notice the above three aspects of the soldering iron heating core, the maintenance of the soldering iron will not be a big problem. However, you should also pay attention to the maintenance of the soldering iron head and the usage skills of the soldering iron. How to choose the soldering iron heating core before use, etc. . Comprehensive considerations can make our tools more convenient to use.
A common failure of a soldering iron is that the heating wire breaks. The simplest repair method is to hinge the broken point, but after this connection, sparks often occur due to loose contacts, and it does not take long for the contacts to break again. There is a quick and reliable repair method: take out the heating wire from the barrel, first remove the oxide near the break, and then splice it tightly. After splicing, sprinkle a little mixed powder of glass and electric porcelain around the joint (mix the two Grinded according to 6:1), after installation, power on for a few minutes, the powder will melt and adhere to the contacts. When repaired this way, there will be no sparks in the contacts and it will be more durable.
