What kind of solder is generally used for electric soldering iron
Solder is a fusible metal that enables component leads to be joined to the connection points on a printed circuit board. Tin (Sn) is a soft, malleable silver-white metal with a melting point of 232°C. It has stable chemical properties at room temperature, is not easy to oxidize, does not lose its metallic luster, and has strong atmospheric corrosion resistance. Lead (Pb) is a soft light blue-white metal with a melting point of 327°C. High-purity lead has strong atmospheric corrosion resistance and good chemical stability, but it is harmful to the human body. Adding a certain proportion of lead and a small amount of other metals to tin can make it low melting point, good fluidity, strong adhesion to components and wires, high mechanical strength, good conductivity, not easy to oxidize, good corrosion resistance, bright solder joints Beautiful solder, generally called solder. Solder can be divided into 15 types according to the tin content, according to the tin content and impurities
The chemical composition is divided into S, A, B three grades. Filiform solder is commonly used in manual soldering. (There are also environmentally friendly lead-free solders that are commonly used now)
flux
Fluxes can generally be divided into inorganic fluxes, organic fluxes and resin fluxes, which can dissolve and remove oxides on the metal surface and wrap
Surround the surface of the metal to isolate it from the air and prevent the metal from oxidizing when heated; it can reduce the surface tension of the solder after melting, which is conducive to the wetting of the solder. (rosin a natural resin flux)
