5 tips for smooth and clean solder joint surfaces during soldering
1. Scratch first and then solder: There are oil stains or rust on the leads of the components to be soldered, which is not easy to eat tin. Even if the solder is barely "pasted", the result is a false soldering. Wipe clean before welding. After dipping the pins into rosin, rub the tip of a tin-containing electric iron 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, and manual soldering does not require tin-dripping treatment (solder wire with flux must be used on the premise). For improper storage of components, resulting in 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 has poor fluidity and is easy to solidify. If the temperature is too high, it is easy to drip. The solder joints cannot hold the solder.
(1) To get the right temperature, use a soldering iron with corresponding power according to the size of the object.
(2) To master the heating time. The tip of the soldering iron presses the solder joint with the solder. The object to be welded is heated. When the solder automatically flows from the tip of the soldering iron to the object to be soldered. Indicates that the heating time is up. At this point, quickly remove the tip of the soldering iron. A bright, smooth solder joint is left. Removing the tip of the soldering iron does not retain the solder in the joint. It means that the heating time is short. Not warm enough. Or the solder joints are too dirty. Before the tip of the soldering iron is removed, the solder flows down and the heating takes a long time and the temperature is too high.
3. Appropriate amount of solder: The amount of solder dipped according to the size of the solder joint is enough to cover the object to be soldered. To form bright and smooth solder joints, if the solder is not enough at one time, it can be filled again. But the tip of the soldering iron must be removed after the previous solder has been dissolved together. Some people pile up solder like a swallow's nest when welding. As a result, a lot of solder was welded, but it was not strong.
4. Hold it steady and not shake: the solder must be held firmly and clamped, especially the solder should not shake during the solidification stage. Shaking in the solidification stage is prone to false welding. Solder joints are like bean curd residue. To stabilize the wrist rest on a support. Sit or stand upright.
5. Use less solder paste: It is an acid additive, and the solder paste should be wiped off after soldering to corrode the circuit. To disengage the solder joints, this small amount, try not to use solder paste.
Rosin is the preferred solder when using rosin-free solder bars. After the soldering iron is dipped in solder, click on the rosin and solder quickly. Or use 95% alcohol and rosin to make flux and 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 the boards as bright as ever.
