Vapor phase, condensation soldering, infrared convection oven, hot air, jets, resistance heaters, open gas flame, induction and soldering iron are all effective methods of melting solder paste. Pre-drying of solder paste to remove solvent is recommended before vapor phase soldering. The flux type and the alloy are matched to produce a stable paste which will reflow to the surface to be joined. Intermixed oil aids in post-soldering removal of flux residues. It is advantageous to remove all flux after soldering, even the mild rosin types with minimal additives which can cause some degree of corrosion.
Oil mixes readily with the flux, forming easily removed materials.
Equipment designed for solvent cleaning should be suitable for the solvent used, just as the solvent should be compatible with the flux. Equipment designed for each method is available for batch type and in-line applications which reduce handling and offer benefits of controllable results and high predictability. All tables and figures were compiled by a BCC, Inc. analyst after reviewing all relevant industry information. The author assumes no liability for the reported information or for its use. The developed information is intended to be as reliable as possible and of a professional nature.