The following principles are generally followed in selecting a soldering iron:
① The shape of the soldering iron tip should be adapted to the requirements of the surface of the soldered parts and the density of the product assembly.
② The tip temperature of the soldering iron head should be compatible with the melting point of the solder, generally higher than the melting point of the solder 30 - 80 ℃ (excluding the temperature of the soldering iron head in contact with the soldering point of the temperature drop).
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 tip of the soldering iron tip temperature 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 cable, consider the choice of 50W endothermic or 45 - 75W external hot soldering iron.
③ Soldering larger components, such as metal chassis grounding pads, should choose more than 100W soldering iron.
Soldering iron use
Soldering iron should not be energised for a long time without use, this is likely to make the core of the soldering iron to accelerate the oxidation and burn off, shorten its life, but also will make the head of the soldering iron due to prolonged heating and oxidation, and even be " burnt " no longer " eat tin ".
Note on 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 in the process of 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 regularly maintained to ensure that the soldering iron head hangs a thin layer of tin.
