Choosing a suitable electric soldering iron will help greatly improve the efficiency of our soldering iron tips in electronic lead-free soldering, but in general, the selection should be determined according to the actual situation of the object to be soldered, generally considering the type of soldering iron and the power of the soldering iron. Wait.
1. Internal heating type electric soldering iron. The internal heating type electric soldering iron is simple in structure, high in thermal efficiency, light and flexible, and should be the first choice. It consists of a connecting rod, a handle, a spring clip soldering iron core, and a soldering iron head (also called a copper head). The soldering iron core is installed inside the soldering iron tip. The soldering iron core is made of nickel-chromium resistance wire wound on a porcelain tube, - the resistance of a 20W electric soldering iron is about 2.4kQ
2. External heat type electric soldering iron. This kind of electric soldering iron has complicated manufacturing process, low efficiency and high price, and is generally composed of soldering iron tip, soldering iron core, outer handle, plug and other parts. The soldering iron tip is installed in the soldering iron core, and is made of copper alloy material with good thermal conductivity copper as the base.
The length of the soldering iron tip can be adjusted (the shorter the soldering iron tip, the higher the temperature of the soldering iron tip). Commonly used in practice are chisel, tapered, circular, circular, tapered and semicircular groove shapes to meet the needs of different welding surfaces.
3. Constant temperature electric soldering iron. A magnet-type temperature controller is installed in the soldering iron head to control the power-on time, which is a constant temperature electric soldering iron. When the welding temperature should not be too high and the welding time should not be too long, a constant temperature electric soldering iron should be used, but its price is high. Although the automatic constant temperature electric soldering iron has many parts, difficult maintenance and high price, it can ensure the quality of solder joints, especially when doing circuit experiments and repairing a large number of printed boards, it is very effective. The electric soldering iron used in the production line adopts the method of automatic voltage regulation to keep the temperature constant, and the cost may be lower. In some areas, the city power is unstable, and the soldering iron is often burned without tin, or the temperature is not enough, and the soldering does not move. Only if the temperature is too high, a series step-down resistor will do.
4. Soldering iron for tin absorption. The soldering iron is a desoldering tool that dissolves a piston-type soldering device and an electric soldering iron into one body. It is easy to use, flexible, and has a wide range of applications. The downside is that only one solder joint can be desoldered at a time.
5. Steam soldering iron. It is a kind of soldering iron that burns and heats the soldering iron tip with flammable gas such as liquefied gas and methane. You can choose to use it when the power supply is inconvenient or cannot supply AC power.
