How long does the soldering iron need to be heated and how long does it continue to work without damaging the iron.
Electricity heating for about 3 minutes, can melt the solder can work. Soldering iron can not be burned empty, you can work continuously.
1, ordinary iron continuous burning, will lead to iron head oxidation, affecting the service life.
2, continuous burning, will find that the iron heating parts of the copper has been burned red, so it will affect the life of the iron.
3, continuous work, such as has been in the welding, so it is not empty burning, long time work will not damage the iron.
4, constant temperature soldering iron can always be energized, because it will not be too high temperature.
Expanded information
1, the soldering iron is divided into two types of external heat and internal heat:
(1) externally heated soldering iron by the iron head, iron core, shell, wooden handle, power lead, plug and other parts. As the iron head is installed in the iron core inside, so it is called the external heat type iron. Soldering iron core is the key component of the soldering iron, it is the electric wire parallel winding in a hollow porcelain tube composition, the middle of the mica sheet insulation, and lead to two wires and 220V AC power supply connection. There are many specifications of externally heated soldering iron, commonly used 25W, 45W, 75W, 100W, etc. The higher the power the higher the temperature of the soldering iron head [1].
(2) The endothermic soldering iron consists of a handle, a connecting rod, a spring clip, a soldering iron core, and a soldering iron head. Since the iron core is installed inside the iron head, it generates heat quickly and has a high heat utilization rate, therefore, it is called an endothermic soldering iron. The common specifications of endothermic soldering iron are 20W and 50W. Due to its high thermal efficiency, 20W endothermic soldering iron is equivalent to about 40W exothermic soldering iron. The back end of the endothermic soldering iron is hollow, for socketed on the connecting rod, and fixed with a spring clip, when you need to replace the head of the soldering iron, you must first exit the spring clip, and at the same time, use pliers to hold the head of the soldering iron front, and slowly pull it out, and remember not to use too much force, so as not to damage the connecting rod.
2, cell phone repair, often to replace the components on the circuit board, the need to use the soldering iron, and it is also very high requirements. This is because the components of the cell phone using surface mount process, small component size, integration is very high, the printed circuit is fine, the pad is small. If the soldering iron is not selected properly, in the welding process is easy to cause man-made failures, such as welding, short circuit or even welded circuit boards, so as far as possible to choose some of the high-grade soldering iron, such as thermostatic temperature control anti-static soldering iron. In addition, some large devices such as shield welding, to use high-power soldering iron, so also want to prepare a common 60W above the thick head of the soldering iron.
3, the use of methods:
(1) choose the appropriate solder, should be used to weld electronic components with a low melting point solder wire.
(2) flux, with 25% rosin dissolved in 75% alcohol (weight ratio) as flux.
(3) soldering iron before use to tin, the specific method is: the soldering iron will be hot, to be just able to melt the solder, coated with flux, and then evenly coated with solder in the soldering iron head, so that the soldering iron head uniformly ate a layer of tin.
(4) soldering method, the pads and components of the pins with fine sandpaper polished, coated with flux. With the soldering iron tip dipped in the appropriate amount of solder, contact the soldering point, to be soldered on the soldering point of all melted and submerged components lead head, the soldering iron head along the component pins gently lifted up to leave the soldering point.
(5) The welding time should not be too long, otherwise it is easy to burn the components, if necessary, tweezers can be used to clip the pin to help dissipate heat.
(6) The solder joint should be sinusoidal peak shape, the surface should be bright and smooth, no tin spikes, the amount of tin is moderate.
(7) after the completion of welding, to use alcohol to the circuit board on the residual flux cleaning, in order to prevent the charring of the flux affect the normal operation of the circuit.
(8) integrated circuits should be the last welding, soldering iron should be reliably grounded, or power off after the use of residual heat welding. Or use a special socket for integrated circuits, weld the socket and then insert the integrated circuit.
(9) Soldering iron should be placed on the soldering iron stand.
