Jia Jinyuan explains how to deal with the problems that occur during the use of solder paste?

Generally, we are doing itSolder pasteOften, some defects occur, which leads to production stagnation and troubles many people. Therefore, when dealing with solder paste, we must follow some production and process procedures. Correspondingly, if some problems arise, solutions must be found accordingly.

What effects do excessively high or low temperatures in the storage environment have on the viscosity of solder paste and activators?
Reply: Excessively high temperatures will reduce the viscosity of the solder paste. The main active ingredient of the activator is rosin, in260℃It will be decomposed by tin, so the temperature of the tin bath cannot be too high.

What will happen if the storage environment temperature of solder paste is too low?
Reply: Low storage temperature. The composition of the welding agent contains a weight of approximately1%-2%Adhesive(Resin). Prevent solder paste from dripping and re-oxidation of the solder surface. in2℃Below, the resin will crystallize, destroying its original molecular structure. When restored to the normal temperature state, the performance of the solder paste is bound to be affected.

How to ensure that solder paste has a good storage environment?
Reply: When the solder paste is not in use, it should be put back in the refrigerator in time. As much as possible24Use unsealed solder paste within hours and do not use it together with unsealed solder paste after putting it back in the refrigerator. When used again, it still needs to be heated.

How to solve the problem of virtual soldering after using solder paste?
Reply: Check whether the temperature and humidity of the solder paste storage environment meet the standards and whether the tin brushing process complies with the standards. If neither of them meets the requirements, you can seek a solution from a professional.

Generally speaking, we open the solder paste before using it, which leads to poor sealing and the evaporation of solvents such as rosin. Try to ensure the service life of the solder paste as much as possible. Do not open the package at will. Once opened, use it up as much as possible. If it is not used up, the remaining part needs to be resealed and stored in the refrigerator. When setting the reflow temperature of the solder paste, if the temperature is not set properly, errors may occur. Reset the reflow soldering temperature parameters (as recommended by the solder paste supplier).

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