A soldering iron is required for the soldering and disassembly of components.
Welding demolition of the preparatory work before
1, get rid of the oxide layer, in addition to the oxide layer is in order to weld the soldering iron head can be easily dipped into the solder, in the use of soldering iron before, can use a knife or file to gently remove the oxidized layer of the soldering iron head, the oxide layer scraped off will reveal the metal luster.
2, dip flux. Such as b figure, the soldering iron head after the removal of oxidized layer, to the soldering iron energized so that the head of the soldering iron is hot, and then the head of the soldering iron will be dipped in rosin (electronic market, do not go to the market), you will see the head of the soldering iron on the rosin vapor issued. (Obsessive-compulsive patients can use the face to try the temperature, when I was a child, every time my father soldering iron on the remote control circuit board, I want to try to smoke the temperature of the soldering head)
The role of rosin is to prevent oxidation of the soldering iron head at high temperatures, and enhance the fluidity of the solder, so that the welding is easier to carry out.
3, hanging tin. When the soldering iron head is dipped in rosin to reach a sufficient temperature, there is rosin vapor coming out of the head of the soldering iron, and the head of the soldering iron is coated with solder.
To the soldering iron head hanging tin benefits is to protect the soldering iron head is not oxidized, and make the soldering iron head easier to weld components, once the soldering iron head "burned to death", that is, the soldering iron head temperature is too high soldering iron head on the solder evaporated, the soldering iron head was burned black oxidation, welding components is very difficult to be carried out, this time you need to scrape off the oxidized layer and then hang tin to be able to use. So when the soldering iron is not used for a long time, you should unplug the power supply to prevent the soldering iron "burned to death".
4, the welding of components
Soldering components, first of all, to be soldered components on the pins of the oxidized layer gently scraped off, and then to the soldering iron energized, heated and then dipped in rosin, when the soldering iron head temperature is sufficient, the soldering iron head at an angle of 45 ° pressed in the printed circuit board to be soldered next to the pins of the component on the copper foil, and then will be the solder wire contact soldering iron head, the solder wire melted into a liquid form, it will flow around the pins of the component, this time will be the head of the iron to move away! At this time, remove the soldering iron head, solder cooling will be component pins and printed circuit board copper foil welded together.
