How to use an internal heating soldering iron?
The tip of the internal heating electric soldering iron is inserted into the soldering iron core. Depending on the power, it can be used after 2 to 5 minutes of power-on. The maximum temperature of the soldering iron tip can reach about 350℃. Commonly used internal heating soldering irons include 20W, 25W, 30W, 50W, etc. For repairing electronic equipment, a 20-30W internal heating soldering iron is generally sufficient.
The structure of internal heating soldering iron
The internal heating electric soldering iron consists of a shell, a handle, a soldering iron tip, a soldering iron core, and a power cord. The handle is made of heat-resistant bakelite and will not be damaged by the heat of the soldering iron. The soldering iron tip is made of red copper, and its quality has a great relationship with the quality of welding. The soldering iron core is made of very thin nickel-chromium resistance wire wound on a porcelain tube. Under normal conditions, its resistance value is 1 to 3 kΩ depending on the power. The soldering iron core shell is generally made of seamless steel tube, so it will not be deformed due to overheating. Some fast-heating soldering irons are made of brass tubes. Due to their fast heat transfer, they should not be used with power on for a long time, otherwise the handle will be damaged. The binding posts are made of copper screws and are used to secure the soldering iron core and power cord.
Use of internal heating soldering iron
Before using a new soldering iron, use a multimeter to measure the resistance at both ends of the power cord. If the resistance is zero, it means there is contact with the wire inside. You should disassemble it, disconnect the wire and plug it in; if there is no resistance, it is mostly the core of the soldering iron. Or the lead is broken; if the resistance is about 3kΩ, plug in the power again. After a few minutes of power on, pick up the soldering iron and dip it in the rosin. Normally there should be smoke and a "squeaking" sound. At this time, dip the soldering iron in it to let the tin Dip the soldering iron fully into it for soldering.
