Why some PCB board solder plate is not easy to tin? Here, NeoDen would like to analyze the possible causes.
I. We need to consider whether the problem is designed by the customer, and we need to check whether the connection mode between the pad and the copper skin will lead to insufficient heating of the pad.
II. Whether there is a customer operation problem. If the welding method is not correct, it will affect the heating power is not enough, the temperature is not enough, the contact time is not enough.
III. Improper storage.
1. Generally speaking, the tin spraying surface will be completely oxidized in about a week or even shorter.
2. OSP surface treatment process can be saved for about 3 months.
3. Long-term preservation of sunk gold plate.
IV. Flux problem.
1. The activity is not enough to completely remove the oxidation substances in PCB pad or SMD welding position.
2. The solder paste quantity is not enough, and the wettability of the flux in the solder paste is not good.
3. some solder joints are not full of tin, may not be fully stirred before use flux and tin powder is not fully fused.
V. Plate factory processing problems.
The oily substance on the pad is not removed, and the surface of the pad is not oxidized before leaving the factory.
VI. Reflow oven welding problems.
Too long preheating time or too high preheating temperature results in flux activity failure; Too low, or too fast, for the tin to melt.
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① Established in 2010, 200+ employees, 8000+ Sq.m. factory
② NeoDen products: Smart series PNP machine, NeoDen K1830, NeoDen4, NeoDen3V, NeoDen7, NeoDen6, TM220A, TM240A, TM245P, reflow oven IN6, IN12, Solder paste printer FP2636, PM3040
③ Successful 10000+ customers across the globe
④ 30+ Global Agents covered in Asia, Europe, America, Oceania and Africa
⑤ R&D Center: 3 R&D departments with 25+ professional R&D engineers
⑥ Listed with CE and got 50+ patents
⑦ 30+ quality control and technical support engineers, 15+ senior international sales, timely customer responding within 8 hours, professional solutions providing within 24 hours