There are several reasons why the solder dots are gray and dull after soldering, and the solder dots are gray and dull after soldering. There are several reasons. The following is introduced by the editor of Shenzhen solder wire manufacturer:
One is the low tin content of the solder wire. Solder wire with a tin content of more than 50% will have a shiny joint, and the soldering effect will be significantly different than that with a lower tin content.

The second is that the residue of the flux stays on the surface of the solder joint without cleaning, and its acid substances corrode the solder joint, which will also cause the solder joint to be dull and dull;

The third is that the temperature of the soldering iron is not reached, and the incomplete melting of the solder will also lead to the darkening of the tin spots.

Methods to solve the problem that soldering tin occupies a dull and dull appearance:

First, according to their own products, select regular manufacturers to buy solder wires with high tin content and original tin as much as possible.

2. Disposable solder wire can be selected. The solder wire series produced by the double Chile solder wire manufacturers are all disposable.

Third, it is to choose a constant temperature soldering iron or adjust the temperature of the soldering iron to completely melt it according to the melting point of the soldering wire during the soldering operation, so as to achieve the effect of beautiful solder point after soldering.

Shenzhen Xinghongtai Tin Co., Ltd. is a professional solder wire manufacturer.It has been focusing on the research and development of solder wire for 12 years.It provides solder wires, lead-free solder wires, lead solder wires, solder wires, solder bars and solder wires of different specifications.