Why do you need rosin for soldering iron
These days I often see people asking why rosin is necessary for soldering, so here's my general summary. Rosin is the most commonly used flux, neutral. If it is a newly printed circuit board, before soldering to apply a layer of rosin on the surface of the copper foil. If the circuit board has been made, you can directly solder. In fact, the use of rosin depends on personal habits, some people are every soldering a component, will be the soldering iron tip in the rosin dip. The use of rosin is also very simple, open the rosin box, put the power of the soldering iron head in the above dip can be. If you are soldering with solid-core solder, adding some rosin is necessary; if you are using rosin tin solder wire, you can skip the rosin.
The role played by rosin when soldering. Rosin in the temperature of the soldering iron will have a weak acidic, can be soldered on the surface of the oxidised layer of cleaning, so that the solder can be infiltrated soldering surface. Now the general electronics industry with the middle of the solder will have rosin, as long as the soldering iron on the dipping point on the line, the solder wire directly to the soldering iron on the work is almost the same. Types of flux can be broadly divided into organic, inorganic and resin three series. Resin flux is usually extracted from the secretion of trees, belongs to the natural products, there is no corrosive, rosin is a representative of this type of group flux, so it is also known as rosin type flux. Because the flux is usually used in conjunction with the solder, so it can be divided into soft flux and hard flux corresponding to the solder. The assembly and repair of electronic products commonly used in the rosin, rosin mixed flux, solder paste and hydrochloric acid and other soft fluxes, in addition, in different occasions should be selected according to the different welding workpiece. The use of flux, must be welded according to the size of the area and the surface of the state of the appropriate amount of application, the amount is too small to affect the quality of welding, the amount is too much, the flux residue will corrode the components or make the circuit board insulation performance deterioration.
