What are the reasons for the insufficient solder filling in smt patch processing?

insmtIn surface mount technology (SMT) processing, soldering and tin application is a crucial step, which directly affects the performance and aesthetic appearance of the circuit board. In actual production and processing, poor tin application may occur due to certain reasons, such as insufficient tin application on common solder joints, which can have a direct impactsmtThe quality of surface mount technology (SMT) processing. Well,smtWhat are the reasons for the incomplete solder coating in surface mount technology (SMT) processing? The following is JJYSolder paste manufacturerLet me introduce it to everyone:

1The wetting performance of the flux in the solder paste is poor and cannot meet the requirements of good soldering.

2The activity of the flux in the solder paste is insufficient and cannot be completely removedPCBSolder pad orSMDOxidizing substances at the welding site

3The flux expansion rate in the solder paste is too high, which is prone to cause voids.

4,PCBSolder pad orSMDThere is a relatively severe oxidation phenomenon at the welding area, which affects the tinning effect.

5The amount of solder paste at the solder joint is insufficient, resulting in incomplete soldering and the appearance of voids.

6If some solder joints are not fully coated with solder, the reason might be that the solder paste was not thoroughly stirred before use, and the flux and solder powder could not be fully integrated.

7During reflow soldering, if the preheating time is too long or the preheating temperature is too high, it will cause the flux activity in the solder paste to fail.

JJY is a well-established solder paste manufacturer with a history of fifteen years. For many years, it has been committed to the research and development and production of solder paste. The solder paste we produce is of stable quality, without solder connection, false soldering or monument erection. No residue, Wuxi beads, bright and full solder joints, firm solder joints, and excellent electrical conductivity. If you have any needs, please feel free to contact us.