Essentials of soldering iron soldering
1. Selection of soldering iron
The power of the soldering iron should be determined by the size of the soldering point, the soldering point area is large, the soldering point of the heat dissipation speed is also fast, so the power of the soldering iron should also be larger. General power of the soldering iron 20W 25W 30W 35W 50W and so on. Choose about 30W power is more appropriate.
Soldering iron after a long time, 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, * good to use the solder wire containing rosin, very convenient to use.
3. Soldering method
Components must be clean and tinned, electronic components in the preservation, due to the role of air 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, the components are easy to weld, not easy to appear the phenomenon of false soldering.
Soldering temperature and soldering time
Soldering should make the temperature of the soldering iron is higher than the temperature of the solder, but not too high, to the tip of the soldering iron to contact the 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, the soldering point is rough and easy to cause false soldering, and vice versa, the soldering time is too long, the solder is prone to flow, and easy to overheat the components damage to the components.
The number of soldering points on the tin
The number of solder on the welding point can not be too little, too little welding is not firm, mechanical strength is also too poor. And too much is easy to cause the appearance of a large pile and the internal not connected. Solder should be just the soldering point on the component pins all submerged, the outline of the vaguely visible as well.
Pay attention to the position of the soldering iron and the soldering point
Beginners in the soldering, generally will be the soldering iron in the soldering place to move back and forth 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, soldering and short-circuiting of components caused by the flow of solder. Virtual welding is more difficult to find, available tweezers hold the component pins gently pull, such as found shaking should be immediately replenished welding.
