BGA welding paste should be selected special BGA welding paste, BGA welding paste is a mixture of forming agents, organic acids, synthetic acids, acid inhibitors, stabilizers, thickeners, thixotropic agents, surfactants, resins and high boiling point solvents, generally with high impedance and non-washing performance, the effect is better than the general flux and rosin.
There are also some people who choose to use rosin to weld, and can also weld successfully, but the success rate of welding is not so good, and the service life is not so long. Therefore, it is recommended to use a special BGA solder paste.