Why does tin keep sticking to the tip when soldering with a soldering iron?
If the soldering iron soldering head is not eating tin, then the iron head will soon oxidize because of the high temperature. Commonly known as burned to death! After oxidizing the soldering iron head black, first to melt and solder that is quite difficult! You will find that the old iron temperature is very high, falling on the tiny crumbs can start a spark! But this solder how can not melt hot! 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 maintenance of circuit boards when removing parts, with a soldering iron to the original pins on the solder sucked away part of, 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 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, generally 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. When we want to eat tin for the original pins, or for the wire to eat tin, or soldering circuit boards on the original, we can use the soldering iron tip in the rosin to eat the solder, directly for the original pins to eat tin or soldering, refinishing and so on.
How do we normally use the soldering iron correctly?
1, the first point to say is that this flux (flux paste) the use of the problem, most of the flux is an acidic flux, the soldering iron head have a certain oxidizing effect, as far as possible or do not go to use.
Here to recommend a better way to make flux, that is, the rosin crushed into powder, poured into the alcohol solution for full dissolution. The ratio is generally 40% of the rosin powder plus 60% alcohol solution, rosin a little more is not a problem. Need to pay attention to not be able to use medical alcohol, the use of more than 90% alcohol solution, at the same time the container to maintain a sealed state.
2, the second point to say is that this power problem, many partners after the use of habit is not timely unplugged. Soldering iron head in the heating state, the natural oxidation of non-stick solder. Therefore, daily use need to do, finished in time to cut off the power supply.
3, the third point to say is that many people ignore the soldering iron head tinning problem, in order to save trouble, most of the use of the soldering iron will not go to the soldering iron head tin. Even after the soldering iron head power off, its temperature is also very high, will also occur with the air oxidation, and in the power off before it is tinned, you can avoid it being oxidized.
4, the fourth point to say is the problem of solder, solder also has good solder also has bad solder. In order to figure cheap, most people buy cheap solder wire. Cheap although cheap, the quality is very worrisome, it is easy to appear solder slag, and even heat into a solder slag.
5, the fifth point is also the author of the last point to emphasize is the iron head, a good iron head can achieve twice the result with half the effort. Our daily use, if you use a round head or knife head can be, but to buy a good point of the soldering iron head. For example, the soldering iron head made of copper is very durable and has a strong antioxidant capacity.
