The principle of the selection of the power of the soldering iron
Selection of soldering iron generally follow the following principles:
① The shape of the soldering iron tip should be adapted to the requirements of the surface of the soldered parts and product assembly density.
② The tip of the soldering iron tip temperature should be compatible with the melting point of the solder, generally higher than the melting point of the solder 30 - 80 ℃ (excluding the soldering iron tip in contact with the soldering point when the temperature drops).
③ The heat capacity of the soldering iron should be appropriate. The temperature recovery time of the soldering iron head should be adapted to the requirements of the soldered object surface. Temperature recovery time is defined as the welding cycle, the temperature of the tip of the soldering iron head due to heat dissipation and reduced, and then return to the * high temperature time required. It is related to the soldering iron power, heat capacity and the shape and length of the iron head.
Select the power of the soldering iron principles are as follows:
① welding integrated circuits, transistors and other heat-sensitive components, consider the choice of 20W endothermic or 25W external heat soldering iron.
② Welding thicker wires and coaxial cables, consider the choice of 50W endothermic or 45 - 75W external hot soldering iron.
③ Welding larger components, such as metal chassis grounding pads, should choose more than 100W soldering iron.
Soldering iron use
Soldering iron should not be energized for a long time without using, this is easy to make the core of the soldering iron to accelerate oxidation and burn off, shorten its life, but also will make the head of the soldering iron oxidized due to prolonged heating, or even be " burned " no longer " eat tin ".
Precautions for the use of soldering iron
① according to the welding object reasonable choice of different types of soldering iron.
② Do not arbitrarily hit the head of the soldering iron during use to avoid damage. Endothermic soldering iron connecting rod steel wall thickness of only 0.2mm, can not be clamped with pliers to avoid damage. In the process of use should be frequently maintained to ensure that the soldering iron head hangs a thin layer of tin.
