(1) If the electric soldering iron does not generate heat, the heating core of the electric soldering iron must be installed correctly.
After some internal heating type electric irons are replaced with new iron cores, the temperature will not go up for a long time after being energized. Couldn't even melt the tin while the handle was hot. During inspection, if the voltage is normal, you need to remove the soldering iron core to check whether the internal installation is reasonable. Because the inner heating iron core is the same length as the outer tube shell, the correct installation method is to keep the end of the soldering iron core aligned with the end of the outer tube, but not indent or protrude. If the iron core is indented a lot, the installation of the electric heating core tends to the handle, which makes the heat concentrated on the handle end, and the heat on the iron head cannot reach the temperature of melting tin.
(2) If the soldering iron does not generate heat, attention should be paid to the wiring of the new soldering iron core
The author has an internal heating type electric soldering iron core that is blown out, and even after replacing several iron cores, the service life is not long. After careful observation and analysis, it is found that the newly replaced soldering iron core leads are too short. There is no room for expansion and contraction of the soldering iron core when it is hot and cold, so that the inner thin resistance wire is pulled off when the soldering iron core is cold and shrinked after unplugging. The correct replacement method should make the lead wire a little longer, 1-2mm, so that it is not easy to burn out. But at the same time, it should be prevented that the line head is too long to cause the line to touch and short-circuit fault.
(3) The electric soldering iron does not heat up, and it is not suitable to use the twisting method to repair the broken heating wire.
After the hot wire or the root lead of the soldering iron is disconnected, it is generally reconnected by the twisting method. This method often causes ignition or thermal fuse due to loose contacts and relatively high contact resistance. A more subtle method is to take out the heating wire, first remove the oxide at the joint, and then twist it tightly. Then put a little broken glass and electric porcelain (6:1) powder around the joint. After the installation is completed, the power is turned on for a few minutes, and the powder is melted and attached to the contact, which is not easy to fuse and is more durable.
