solder
Solder, usually tin alloy, it is also known as solder, for the low melting point alloy (English: Fusible alloy), in the welding process is used to connect metal parts, the melting point of the material should be lower than the melting point. The so-called solder is soft solder, the melting point of 90 to 450 degrees Celsius, soft welding is widely used in connecting electronic components and circuit boards, water pipe wiring works, sheet metal processing. Hand welding is often used soldering iron. The solder used has a melting point of 180 to 190 ° C. The use of solder with a melting point above 450 ° C is called hard soldering, silver soldering, or brazing. The proportion of the composition of the eutectic alloy has a fixed melting point. The non-eutectic alloys have separate solid-phase temperatures and liquid-phase temperatures, and when solid-phase and liquid-phase temperatures are present, solid particles are dispersed in the liquid metal paste and are disturbed when the solder is not fully cured , It will cause bad circuit link. Therefore, the eutectic alloy is no longer troubled. However, wipe the lead joint (wiped ...