Tips for smoothing and cleaning the surface of soldering iron solder joints
1. Scrape first and then solder: If there is oil stains or rust on the leads of the components to be soldered, it is not easy to eat tin. Even if the solder is barely "pasted", the result will be false soldering. Scrape clean before welding. Dip the pins in rosin and rub the tin-containing soldering iron tip back and forth on the pins until a thin layer of solder is coated on the pins.
The solderability of most electronic components is very good. Manual welding does not require tin dripping treatment (the prerequisite is to use solder wire with flux). If the components are improperly stored and lead to oxidation or dirt on the component pins, tin dripping treatment is required. .
2. Master the temperature skills. If the temperature is not enough, the solder will have poor fluidity and will easily solidify. If the temperature is too high, it will drip easily. The solder joints cannot hold the solder.
(1) If the temperature is suitable, use a soldering iron with corresponding power according to the size of the object.
(2) Master the heating time. The soldering iron tip carries solder to press the welding point. The object to be welded is heated. When the solder automatically flows from the soldering iron tip to the object to be soldered. Indicates the heating time has expired. At this time, quickly remove the soldering iron tip. This leaves a bright, smooth solder spot. The solder joint cannot be retained by removing the soldering iron tip. It means the heating time is short. The temperature is not enough. Or the solder joints are too dirty. The solder flows downward before the soldering iron tip is removed. The heating time is too long and the temperature is too high.
3. Apply an appropriate amount of solder: The amount of solder dipped in according to the size of the solder joint is enough to cover the object to be soldered. Form a bright and smooth solder joint. If the solder is not enough at one time, it can be replenished. However, the soldering iron tip must be removed after the previous solder has been melted together. Some people pile up solder like a swallow building a nest when welding. As a result, a lot of solder was soldered but it was not strong.
4. Hold it steady and not shake: The soldering object must be held steady and clamped tightly, especially during the solidification stage of the solder, it must not shake. Shaking during the solidification stage can easily cause false welding. The solder joints are like tofu. Rest your wrists on a support for stability. Be upright when sitting or standing.
5. Use less solder paste: It is an acidic additive. The solder paste should be wiped clean after soldering to prevent corrosion of the circuit. To detach the solder joints, use this small amount and try not to use solder paste.
Rosin is a better solder when using rosin-free solder strips. Dip the soldering iron into the soldering tin, then tap on the rosin and solder quickly. Or use 95% alcohol and rosin to make a flux and just put a drop on it when welding.
In addition, the solution can also be brushed on clean solder joints and printed circuit boards to make them as bright as ever.
