What types of solder paste are there? How to choose solder paste?

in SMTIn the production and processing of wafersSolder pasteIt is an indispensable processing material. Solder, also known as solder paste, is SMTPatch is mainly applied in SMTA new type of soldering material for surface patches, generally composed of soldering powder, flux, other surfactants and thixotropic agents. Different solder pastes can vary. Everyone can take a look:

(1The grade of solder paste should be selected based on the value and application of the electronic product itself. Products with high reliability requirements should use high-quality solder paste. Of course, the price of high-quality solder paste is also very high.

(2The alloy group of solder paste should be determined based on the production process of the product, the manufacturing process of the printed circuit board and the components.

(3Solder paste should be selected based on the cleanliness requirements of the printed circuit board and the cleaning process after soldering:When the solvent cleaning process is adopted, solvent cleaning solder paste should be selected. When the water cleaning process is adopted, water-soluble solder paste should be selected. When a non-cleaning process is adopted, halogen-free and strongly corrosive compounds should be selected.

(4"Basis"pcbDifferent types of solder paste should be selected based on the inventory time of circuit boards and electronic components and the level of surface oxidation. Electric welding is just so-soSMTFor products, choose vitalityRMAGrade solder paste High reliability, aerospace and military electronic equipment, available for selectionRHighly active solder paste The storage time of printed circuit boards and electronic components

(5According to the assembly density of the circuit board, select solder paste with different particle size distribution of aluminum alloy solder powder. When soldering circuit boards with narrow interval solder layers and pins, use particle size distribution3Type20~45μmSolder paste. 

(6Select solder pastes of different viscosities based on the method of coating solder paste on the circuit board and the assembly density, and choose those with higher density for printing

To master the relevant solder paste, lead-free solder paste,Solder pasteWe warmly welcome all friends to consult Shenzhen JJY Industrial Production High-tech Co., Ltd. for difficulties in welding methods. Let's learn and grow together!