Summary of the main points of soldering iron soldering technology
1, the choice of soldering iron
The power of the soldering iron should be determined by the size of the welding point, the area of the welding point is large, the welding point of the heat dissipation speed is also fast, so the choice of the power of the soldering iron should also be larger. General power of the soldering iron 20W 25W 30W 35W 50W and so on. In the production process, the choice of about 30W power is more appropriate.
Soldering iron after a long time of use, the head of the soldering iron will generate a layer of oxide, then it is not easy to eat tin, then you can use a file to file off the oxide layer, the soldering iron will be energized, such as the head of the soldering iron is slightly hot when inserted into the rosin, coated with solder can be continued to use the newly purchased soldering iron must be on the tin and then can be used.
2、Solder and flux
Choose low melting point of the solder wire and no corrosive flux, such as rosin, should not be used industrial tin and corrosive acidic soldering oil, the best use of rosin-containing solder wire, it is very convenient to use.
3、Soldering method
Components must be clean and tinned, electronic components saved in the air, due to the role of oxidation, the component pins are attached to a layer of oxide film, while there are other dirt, welding can be used to scrape off the oxidized film, and immediately coated with a layer of solder (commonly known as tin-lined), and then welded. After the above treatment components are easy to weld, not easy to appear virtual welding phenomenon.
(1) Soldering temperature and soldering time
Soldering iron temperature should be higher than the temperature of the solder, but not too high, in order to soldering iron head contact rosin just smoke for good. Soldering time is too short, the temperature of the soldering point is too low, the soldering point is not fully melted, soldering point rough easy to cause welding, and vice versa, the soldering time is too long, the solder is easy to flow, and easy to make the components overheating damage to the components.
(2) The number of soldering points on the tin
Welding point on the number of solder can not be too little, too little welding is not firm, mechanical strength is also too poor. And too much is likely to cause the appearance of a large number of internal not connected. Solder should just be soldered on the component pins all submerged, the outline of the vaguely visible as well.
(3) pay attention to the position of the soldering iron and soldering points
Beginners in the soldering, generally move the soldering iron back and forth in the weld or squeeze hard, this method is wrong. The correct method is to use the soldering iron's tin-lined surface to contact the welding point, so that the heat transfer area is large, welding speed.
4, check after welding
After the end of welding must be checked for leakage of welding, soldering and short-circuiting of components caused by the flow of solder. Virtual welding is more difficult to find, available tweezers clamped component pins gently pull, such as found shaking should be immediately replenished welding.
