During welding, the brightness of the solder joints welded by the
solder wire will be insufficient. According to theoretical common sense, the brightness of the solder joints is not good. It should be that the tin content of the solder wire is insufficient. So is the tin content of the solder wire insufficient? , In fact, the deviation of the brightness of solder joints is a relatively complicated problem, which needs to be analyzed carefully.
There is no doubt that the tin content of the solder wire has a certain influence on the brightness of the solder joints. But generally speaking, the tin content within 5°C can be distinguished, and the lower the tin content, the dimmer the brightness of the solder joint itself, and this is just the normal tin content range. In addition, when the content of impurities in the solder wire is large, the brightness of the solder joints will also be significantly affected, such as excessive content of copper, silver and bismuth.
In fact, the temperature also has an impact on the brightness of the solder joints. To make the solder joints show the best luster, an appropriate temperature must be reached. Insufficient temperature will reduce the glossiness of the surface and make it look rough. Luzhi Island has proved that there is a significant difference in the brightness of the solder joints soldered by a 20W electric soldering iron and a 60W electric soldering iron. .
Even the flux used with it can affect the solder joints. Different types of fluxes used in conjunction with solder wires produce inconsistent soldering effects. This is because different types of fluxes have active ingredients that have different effects on the brightness of solder joints. Luzhi Island has a special matting flux, which is different from ordinary fluxes in that it can reduce the brightness of solder joints. The glossiness of solder joints does not irritate the operator's eyes and cause visual fatigue.
Therefore, the lack of brightness of the solder joints cannot be generalized as insufficient tin content of the solder wire. It is necessary to comprehensively analyze and judge the cause from various aspects and angles, so as to truly solve a problem.
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