What are the reasons for excessive tin slag in the soldering process?
During the whole wave soldering process, the tin bar will produce tin slag, but sometimes there will be too much tin slag. At this time, we must pay attention to whether there is a problem. The following solder paste manufacturers will explain to you:
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First of all, we must correctly distinguish whether the tin dross that often appears is normal tin dross. Under normal circumstances, tin dross in the form of black powder is in a normal state, while tin dross in the form of tofu is abnormal. For this type of situation, we deduce that there are the following aspects of the problem:
1. In this case, the biggest reason is some problems of the wave furnace of the wave soldering equipment. Among them, the design of many wave furnaces is not as good as ideal, the wave peak is also high, the distance between the peak platforms is too wide, and the distance between the double wave furnaces is close. Very close, at the same time, a rotary pump is used in the equipment, etc., these are the reasons that may cause tin slag in the environment. When the wave peak is so high, the difference in temperature drop tends to increase during the entire process of solder falling from the peak to the bottom, and the solder will mix with air, which will cause oxidation or semi-dissolution of the solder, resulting in the appearance of tin slag. questionable. If the control measures of the rotary pump are not done, the tin slag is continuously pressed into the furnace, and the chain reaction of the cycle may cause problems with the tin slag.
2. The temperature is so low, the temperature control of wave soldering is relatively low, generally 280 ° C ± 5 ° C, and this temperature is the lowest temperature necessary for the phase change process of the solder, and it is difficult to achieve a good temperature if the temperature is lower. Ground melting, indirectly causing more tin slag.
3. The most suitable tinning time is missed. In the wave soldering process, the time for adding tin strips is very important. When it is more appropriate, the distance between the tin surface and the peak is always the shortest.
4. The tin slag in the furnace is not cleaned up immediately. Whether the tin slag is disposed of from time to time is also a main reason for the problem. There are many tin slags in the furnace, which will cause the solder falling from the peak to fail to fall into the furnace as soon as possible, which is often limited On the tin slag, resulting in uneven heating, which leads to more tin slag.
5. Whether the wave furnace is regularly treated daily, the wave furnace is often not treated, which will cause a relatively high concentration of impurities in the furnace, which will also cause more tin slag.
The above are the main reasons for the large amount of tin slag in the furnace. I hope it can help you. Jiajinyuan is a company that conducts mutually beneficial cooperation with manufacturers of electronic raw materials. At the same time, it also produces welding wire, welding rod, solder paste, and solder paste for other enterprises; a variety of successful cases of chemical raw material product research and development, and the overall strength creates a high-quality and honest sales market.
