Why does the wave soldering pass through the furnace?
Release time:
2023-02-24 17:42
Source:
It is a common problem in wave soldering production that circuit boards will be connected to tin after passing through a wave soldering furnace. Guangshengde shares that there may be the following reasons for the soldering of circuit boards through a wave soldering furnace:
1. The activity of the flux is not enough, the wettability of the flux is not enough, the amount of flux coating is too small, the flux coating is uneven, etc.
2. Insufficient preheating temperature, too high or too low preheating temperature may cause low flux activity, resulting in insufficient tin temperature, poor wetting force and fluidity of liquid solder, and solder joints between adjacent lines Bridging occurs.
3. No flux is used or the flux is insufficient or uneven, and the surface tension of tin in the molten state is not released, resulting in easy tin connection.
4. The temperature of tin and tin furnace is also related to preheating temperature and welding speed.
5. Regularly check and analyze the tin composition. It is possible that the content of copper or other metals exceeds the standard, which will reduce the fluidity of tin and easily cause tin connection.
6. The solder is impure. If the impurities contained in the solder exceed the allowable standard, the characteristics of the solder will change, and the infiltration or fluidity will gradually deteriorate. If the antimony exceeds 1.0%, the arsenic exceeds 0.2%, and the interval exceeds 0.15%, Solder fluidity will decrease by 25%, and arsenic below 0.005% will cause dewetting.
7. The track angle of wave soldering, PCB board deformation, etc. may also affect tin connection.
It should be noted that there are many reasons for wave soldering to go through the furnace, and it needs to be analyzed and dealt with according to the specific situation. If the problem persists, it is recommended to contact a professional technician for inspection and maintenance.
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