How to Choose Flux for PCBA Processing
In PCBA factory , flux is an indispensable auxiliary material in the welding process. The quality of the welding effect is not only related to the quality of the welding technology, components and printed circuit boards, but also the selection of flux is very important. Do you know how to choose flux? 1. Performance requirements for flux 1) The flux need to have the characteristics of removing surface oxides, preventing re-oxidation and reducing surface tension, which is the basic performance that the flux must have. 2) The melting point should be lower than the solder. Before the solder melts, the flux must melt first to fully exert its fluxing effect. 3) The wetting and diffusion speed of flux is faster than that of molten solder. 4 ) The viscosity and density of flux are smaller than that of solder. A high viscosity will make wetting and diffusion difficult, and a high density will not cover the solder surface. ...