Why is rosin used in electric soldering irons?
Rosin is the most commonly used solder, which is neutral and does not corrode circuit components and soldering iron tips. It can allow tin droplets to quickly adhere to the circuit board during soldering, and the rest can sit and wait for the tin droplets to cool down, ensuring the quality of the soldered product.
Firstly, in the case of a liquid tin droplet, the solder joint is very full because the fluidity of the liquid tin droplet is not very good, and it usually stays next to the electronic foot. When it solidifies, there will be no significant changes.
The function of rosin also includes the ability to remove oxides on metal surfaces and assist in the diffusion of tin.
In terms of solder joints, they can serve as connecting parts without providing mechanical support; Coordinate heat dissipation; And the conduction effect of electricity, so from these aspects, rosin is very helpful for ordinary welding requirements.
The main function is to assist welding, and the usage is: 1. Dip a hot soldering iron in soldering tin. 2. Dip a hot soldering iron in rosin. 3. Weld with a soldering iron containing rosin and soldering tin
The biggest benefit of rosin is to tin the wires, because it is difficult to tin the wires without rosin. First, heat the electric soldering iron, then put it in the rosin, take out the electric soldering iron, dip it in tin, and then put it in the rosin. Then, put the wires to be tinned in, making it much easier to tin. Another function is to put the newly purchased electric soldering iron into rosin, then tin it, and fill the entire soldering iron head with tin. After using the soldering iron, it must be filled with tin. The next time you use the soldering iron, it will not be difficult to use due to the oxidation of the soldering iron head.
Rosin serves as a soldering flux in welding, playing a soldering role.
In theory, the melting point of flux is lower than that of solder, and its specific gravity, viscosity, and surface tension are all lower than that of solder. Therefore, during welding, the flux melts first, quickly flows and covers the surface of the solder, isolating air and preventing metal surface oxidation. It can also react with the surface oxide film of solder and the soldered metal at high temperatures during welding, causing it to melt and restore a pure metal surface. Proper soldering helps to produce satisfactory solder joint shapes and maintain the surface gloss of the solder joints.
If it is a newly printed circuit board, a layer of loose perfume should be coated on the surface of the copper foil before welding. If it is a pre made circuit board, it can be directly soldered. In fact, the use of rosin depends on personal habits. Some people will soak the soldering iron tip on the rosin after welding each component; I always soak some rosin on the tip of the soldering iron when it is oxidized and inconvenient to use. The use of rosin is also very simple. Open the rosin box and soak the powered soldering iron tip on it.
If solid solder is used during welding, adding some rosin is necessary; If rosin tin solder wire is used (with flux wrapped inside the wire core), rosin can be omitted.
Due to the formation of an oxide film on the metal surface after contact with air, the higher the temperature, the more severe the oxidation. This oxide film prevents the wetting effect of liquid solder on the metal, just like oil on glass prevents water from wetting. Flux is a specialized material used to remove oxide films, also known as flux. Flux has three main functions: 1. Remove the oxide film. The essence is that the substances in the flux undergo a reduction reaction, thereby removing the oxide film, and the reaction products become suspended slag, floating on the surface of the solder. 2. Prevent oxidation. After melting, it floats on the surface of the solder, forming an isolation layer, thus preventing oxidation of the welding surface. 3. Reducing surface tension and increasing solder flowability can help wet solder components.
