After completing the pre welding treatment, welding can be officially carried out:
(1) Hold an electric soldering iron in your right hand. Use pointed nose pliers or tweezers with the left hand to grip components or wires. Before welding, the electric soldering iron should be fully preheated. Tin should be eaten on the edge of the soldering iron head, that is, a certain amount of solder should be added.
(2) Place the tip of the soldering iron tightly against the solder joint. The electric soldering iron forms an angle of approximately 60 ℃ with the horizontal plane. To facilitate the flow of molten tin from the soldering iron head to the solder joint. The duration of the soldering iron tip staying at the solder joint should be controlled within 2-3 seconds.
(3) Lift off the soldering iron tip. The left hand still holds the component. Wait for the tin at the solder joint to cool and solidify before releasing the left hand.
(4) Use tweezers to rotate the leads to ensure they are not loose, and then use side cutters to cut off excess leads.
Welding quality - When welding, ensure that each welding point is firmly welded and in good contact. To ensure welding quality, its typical characteristics are bright tin spots, smooth and without burrs, and moderate tin content. The fusion of tin and the soldered object is firm, and there should be no false soldering or false soldering.
False soldering refers to a situation where only a small amount of tin is soldered at the solder joint, resulting in poor contact and intermittent disconnection. False soldering refers to a situation where the surface appears to have been soldered, but it is not actually soldered on. Sometimes, with just one hand pull, the lead can be pulled out of the solder joint.
When soldering circuit boards, it is important to control the time. If it is too long, the circuit board will be burnt or the copper foil will fall off. When disassembling components from the circuit board, the electric soldering iron tip can be attached to the solder joint, and after the tin on the solder joint melts, the component can be pulled out.
How to disassemble and replace components - In fact, disassembling and replacing components is incredibly simple. It is easy to use a soldering device to remove all the solder from the component pins. Here is a small trick: most circuit boards nowadays are finely crafted, and soldering is rarely used, making it difficult to melt. Therefore, we can add some solder to the pins and use the soldering device to make it much easier.
Another method, as mentioned earlier, is to directly use an electric soldering iron to melt off the solder, but this poses a significant risk. It is important to be careful not to completely melt off the solder joints, but also to avoid burning the components if they are in contact for too long. The commonly used method is to use tweezers to clamp the component and pull it out during heating. When the temperature reaches, the component will be pulled out, but remember not to use too much force, otherwise the pin will break in the solder and cause trouble.
Of course, for safety reasons, a combination of the two methods is best because sometimes due to the small size of the component socket, it is difficult to clean the suction soldering. At this point, removing the suction soldering device will stick, so it can be heated and removed with an electric soldering iron.
Welding is actually not that scary, perhaps for beginners, it is difficult to master at first try, but practicing more will naturally make them proficient. In short, for hands-on enthusiasts, as long as you practice more, it will be a matter of time before you master the tricks.
