Why does the tin always stick to the soldering head when the electric soldering iron is soldering
If the welding head of the electric soldering iron does not eat tin, the tip of the soldering iron will soon be oxidized due to high temperature. Commonly known as burnt to death! After oxidation, the tip of the soldering iron turns black, and it is quite difficult to melt and solder first! You will find that the temperature of the old iron is very high, and even small debris can cause sparks! But the solder can't be hot! So the soldering iron tip must retain a layer of tin film to protect the soldering iron tip from oxidation. When welding, the heat can be transferred out in time to ensure the welding quality.
And you said that there will always be excess solder on the tip of the soldering iron, which is also a normal phenomenon. When soldering, the melted solder will always flow from the place with low temperature to the place with high temperature. So we can take advantage of this feature. When repairing the circuit board and removing parts, use a soldering iron to suck away part of the solder on the original pins. Of course, it will be better to use a tin absorber and a tin absorber to remove the solder.
After the soldering iron tip absorbs excess solder, we can use the method of shaking the soldering iron gently, and use inertia to shake off the excess solder on the soldering iron tip. Generally, dip the soldering iron tip in rosin, and then shake your wrist quickly , Throw the solder into the rosin box. And when we want to eat tin for the original pins, or tin for the wires, or solder the originals on the circuit board, we can use the tip of the soldering iron to eat solder in the rosin, and directly eat tin or solder for the original pins to make up for it. welding etc.
How to use soldering iron rosin
1. Rosin is a flux. When the tip of the soldering iron taps the rosin, the rosin makes a "chuck" sound and emits a puff of white smoke, indicating that the temperature is suitable and it can be welded. When using it, you can coat the solder joints and weldments Rosin (or tap it after it is hot), and then, touch the soldering iron tip, solder, and solder joint for 2-3 seconds. After the solder is evenly melted, remove the soldering iron tip to complete the soldering.
2. With rosin, it is easier to "eat tin", and the soldered spots are brighter, and it is not easy to form a false weld.
3. Rosin prevents the oxidation of the weldment, first remove the oxide layer, and hang tin in the rosin. Put some rosin on the solder joints, hang tin in the rosin, and then solder.
4. Wipe off the oxide layer of the copper wire with fine sandpaper, bury (put) it in rosin, put a large tin ball (about the size of a match head) on the soldering iron, put it on the copper wire for about a second or two, lift the soldering iron and take it out line. Put some rosin on the circuit board, put a small tin ball on the soldering iron for about a second or two, wait for natural cooling for more than 30 seconds, then put the wire on, and then relax the incense, put a small tin ball on the soldering iron for about one or two seconds Seconds, remove the soldering iron, hold the thread and wait for natural cooling for more than 3 seconds before letting go. Pay special attention to the grounding of the soldering iron shell, and the grounding of people. anti-static. Some components are soldered while connected to "ground". Don't!
