Why does tin keep sticking to the soldering tip when soldering with a soldering iron?
If the soldering iron soldering head is not eating tin, then the iron head will soon oxidise due to the high temperature. Commonly known as burnt! After oxidising the soldering iron head turns black, it is quite difficult to melt and solder first! You will find that the old iron temperature is very high, falling on the tiny crumbs can start a spark! But the solder can't be melted! So the soldering iron head must retain a layer of tin film to protect the soldering iron head from oxidation. When welding can be timely heat transfer, to ensure the quality of welding.
And you said that the soldering iron head will always have excess solder, which is also a normal manifestation. 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, in the repair of circuit boards when removing parts, with a soldering iron to the original pins on the solder suction part, of course, with the use of tin suction tape and tin sucker to remove the solder effect will be better.
After the soldering iron head adsorption of excess solder, we can use the method of dumping, gently vibrate the iron, the inertia of the soldering iron head of excess solder shock off, usually directly in the rosin dipped in the soldering iron head, and then a quick shake of the wrist, the solder flung to the rosin box inside. And when we want to eat tin for the original pin, or for the wire to eat tin, or soldering circuit boards on the original, we can use the soldering iron head in the rosin to eat the solder, directly for the original pin to eat tin or soldering, patch soldering and so on.
