Detailed explanation of the operating principles of the four solder removal methods during welding
1. Solder desoldering method
The negative pressure of the built-in cavity of the solder suction device is used to suck the heated and molten solder into the cavity to separate the leads from the pads.
2. Soldering rope desoldering method
The soldering rope desoldering method is a method that uses a soldering rope to suck away the molten solder to separate the leads from the pads.
Coat the braided wire part with rosin flux, then place it on the solder joint to be desoldered, and then place the soldering iron on the braided wire to heat the solder joint. After the solder joint melts, it will be absorbed by the copper braided wire.
If the solder joint solder is not completely sucked out at one time, it can be done a second or third time until it is completely sucked out. When the braided rope is filled with tin, it can no longer be used and the area filled with solder needs to be cut off.
3. Blank pin desoldering method
The empty needle desoldering method is to use a hollow needle (a syringe needle can also be used) of a similar size (the hole diameter is slightly larger than the diameter of the lead) and put it on the lead that needs to be desoldered. When the soldering iron heats the solder and melts it, quickly rotate the needle until the soldering iron withdraws. It can be stopped after the solder solidifies. At this time, the needle is pulled out and the leads have been separated.
4. Use soldering iron to desolder
The soldering iron is a special desoldering iron that can absorb tin into the inner cavity while heating the solder joints to complete desoldering.
How to deal with tin crawling on the soldering iron tip
1. Return to the factory and replace with a product with thicker chrome plating or better handling.
2. Replace the tin wire with better quality and less impurity content. Appropriately lowering the operating temperature can improve the tin creep phenomenon;
3. Purchase an alloy soldering iron head with a special anti-tin erosion layer treatment on the surface. This will prevent tin from running off, the skin will not fall off, and the service life will be extended.
The function of chromium plating is only to prevent tin from creeping. Tin crawling will occur on any electroplating soldering iron head, and the original one is no exception, it just appears sooner or later.
