In the electronics industry, solder wire is the most common solder material. Solder wire is the medium between the connecting component and the circuit board, which is essential in production and maintenance work. The main component of rosin in the solder wire is about 5-6% of rosin anhydride and 80% resin hydrocarbon, volatile oil and trace bitter substances. When the solder wire is soldered, the working temperature reaches 250 °C, and some oxides can be dissolved. carbon dioxide. Many users don't understand the tin content of the solder wire. Today, the staff of Shenzhen Xinghongtai manufacturers will share with you:

What should be the tin content of the solder wire? Different solder wires can be different. Among them, the main components of lead solder wire are lead and tin, and the eutectic point of tin-lead alloy is 6337, which means that the tin (sn) content is 63%, the lead (pb) content is 37%, and the eutectic temperature is 183 degrees. The crystal structure of the crystal grain is very thin, and is not easily changed by the influence of the environment, so that the reliability of the PCBA is ensured, and the operating temperature is low, which facilitates the soldering operation. In practice, it is divided into many alloy matching solder wires, such as 60 tin / 40 lead, 55 tin / 45 lead, 50 tin / 50 lead, 45 tin / 55 lead, 40 tin / 60 lead, etc., which alloy to choose The ratio needs to take into account its own needs, cost budget and welding efficiency.

In order to meet environmental protection requirements, many factories have begun to use lead-free solder wire, with a conventional tin content of 99.3%. Solder wire tin content ratio: 63 tin / 37 lead, 60 tin / 40 lead, 55 tin / 45 lead, 50 tin / 50 lead, 45 tin / 55 lead, 40 tin / 60 lead, 35 tin / 65 lead Etc., because the price of tin is about 6 times the price of lead, so the more tin content, the better the price; in addition, the pure tin solder wire, the tin content can reach 99.3%, the higher the purity, the more environmentally friendly, no harm to the body.

The smoke generated by the solder wire is caused by the vaporization of the flux generated by the flux in the solder wire and the high-temperature soldering iron. The solder wire additive contains rosin and chemical raw materials, and the long-term inhalation causes undesirable effects on the human body. Keeping ventilation will be good.

Work protection: Work must be done in a ventilated environment. For long-term operation in the same place, it is best to install an exhaust fan.