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Causes of Insufficient Gloss of Solder Joints in SMT Processing

180 Published by FASTPCBA 6月 14,2019

Causes of Insufficient Gloss of Solder Joints in SMT Processing

In the SMT processing welding technology, many customers usually have requirement for the brightness of the solder joints. After all, the brightness of the solder joints will give us a bright feeling. In the process of SMT processing and welding, there is no guarantee that the degree of lighting of each solder joints can reach the degree of sparkling. So what is the reason why the solder joints gloss is insufficient in the SMT processing welding ? The following FASTPCBA SMT processing manufacturers analyze and introduce it to all of you.

Solder Joints

1, Tin powder in solder paste has an oxidized appearance.

2, The flux in the solder paste itself has an additive that forms a matting effect.

3, In theSMT processing, the reheating temperature of the reflow soldering is low, and there is a possibility that the non-evaporating material remains in the surface of solder joint.

4, There isrosin or resin residueon the welding spot surface after welding. This is the superficial phenomenon that will often be seen in actual operation, especially when using rosin-type solder paste, although rosin-type flux and clean-free flux will make welding spot is slightly brighter, but the presence of the residue tends to affect this effect, especially at larger solder joints or IC pins the effect more significant . If   can be cleaned after soldering, the solder joint gloss should be improved.

5, Due tothe brightness of the solder joints have no standard to accord to, If compared there is a certain difference between the silver-free solder paste soldered product and the silver-containing solder paste soldered products, it is necessary for the customer to clarify the solder joint requirements to the supplier when selecting the solder paste.

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