Analisis of the structure composition and temperature control method of the heater for electric soldering iron
The temperature of the soldering iron head is provided by a heater, also known as the soldering iron core, which is matched with a thermal probe thermocouple and a temperature control system.
Traditional electric soldering iron heaters commonly use nickel chromium wire resistance heaters and ceramic heaters. Usually, the electric heating wire is wound inside the ceramic and made into different shapes. Two types of heaters are slender and can be inserted inside the soldering iron head. This structure is called an internal heating type, which has the advantage of small volume. The other type is made into a cylindrical sleeve outside the soldering iron head, which is called an external heating type and has the characteristic of fast heating.
Electric soldering irons must provide the required heat to the welding site in a short period of time, so the temperature of the soldering iron head should reach a certain height in a short period of time. However, the temperature of the soldering iron head cannot be unlimited. When the temperature reaches around 400 degree , the loss of copper will accelerate. At this time, copper will become annealed and soften, dan with slight external force, it will bend. The coating is easy to oxidize, and the solder is not easy to wet, When the solder adhered to the soldering iron head is granular, the heat transfer effect becomes worse. Therefore, we must effectively control the temperature of the soldering iron.
Temperature control method for electric soldering iron:
The temperature range of electric soldering iron is generally 330~370 degree . Generally, there are two temperature control methods for electric soldering iron.
(1) The traditional temperature control method uses a closed-loop temperature control circuit, and the accuracy and reaction speed of its temperature control first depend on the structure of the heater and its temperature control accuracy. The temperature control accuracy accuracy of traditional electric soldering irons depends on the thermocouple and controller temperature compensation feedback circuit. In teori, no matter how high the temperature control accuracy is, the heater operates intermittently, that is, when the heater is fully connected, it operates at full power, and when it is disconnected, it has no power output, which will inevitably lead to temperature fluctuations. In addition, the the delayed heat conduction will cause the temperature of the soldering iron head to oscillate
(2) Another temperature control method, which is also the latest in the industry today, is the no external temperature control circuit technology adopted by OK Company. It uses a very thin magnetic material to form an atomic level temperature control unit to directly measure the heat energy required by the solder joint, and uses its own temperature compensation feedback circuit to achieve instantaneous power compensation. According to the requirements of the solder pad, accurately provide this heat to ensure the formation of reliable solder joints, and the heating power changes with the load, without temperature overshoot, and the temperature is always constant.
This temperature control technology, also known as Smart Heat technology, has the advantage of directly transferring heat from the heating element to the solder joint without first storing it on the soldering iron head. Therefore, it has the advantages of fast heating and low welding temperature. After the soldering iron head tests the thermal load, it can automatically provide the required heat to the solder joint tepat. Jika suhu daripada the pematerian besi kepala drops during welding, it can quickly provide heat to keep the soldering iron head at a constant temperature, Welding points can provide as much heat as they need, so operators can adjust the soldering iron head head without worrying. The soldering iron head manufactured using this technology has a lightweight and agile appearance.
