Small knowledge of soldering station-what are the factors that directly affect the brightness limit of solder joints?
Whether the welding point is bright is also an important parameter in the welding process. Whether the solder joints are bright or not affects the appearance of the product. Now many product users have certain requirements for the appearance of the product. It is recommended that we pay attention to the brightness of the solder joints when completing the processing and soldering of the solder paste. In the process of solder paste chip processing and welding, it is not guaranteed that the brightness of each solder joint can meet the requirements, so what are the factors that directly affect the insufficient brightness of solder joints in solder paste chip processing? Today, solder paste manufacturers will take you to understand and analyze:
The reasons that directly affect the brightness limit of solder joints are nothing more than the following aspects, which are the reasons for the operation process in the production process and the problems of welding materials.
one, the operation process in the production process:
1. During production, the working temperature in the furnace is far from enough or the temperature in the furnace rises, which may cause the solder joint luminosity to be far from enough;
2. If the reflow time is too long and the preheating temperature is too low, it will also cause discoloration of solder joints, and nitrogen protection can be added.
3. If the cooling is completed in time or the cooling is relatively slow, there will be dullness, and the brightness of the solder joints can also be solved by accelerating cooling.
Two, the problem of welding materials:
1. The solder joints of tin-lead alloy solder paste will be brighter than lead-free solder paste, and the surface of solder joints of lead-free solder paste will be rougher. Once lead-free solder paste is needed, it can be modified to silver-containing Lead-free solder paste can also effectively improve the brightness of solder joints;
2. Solder paste contains silver surfactant. We have various market demands for the luminosity of solder joints. Most people welcome the bright solder joints, but some people think that the opposite brightness seriously affects the visual inspection routine. Therefore, some solder pastes make full use of matting agents. It is recommended that you pay attention to the flux material formula of the solder paste when purchasing solder paste.
3. The degree of oxidation of the solder paste is too high. It is recommended to fully use it within 24 hours after the solder paste is disassembled. It must be stored at 3-5°C before storage.
