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There are many types of solder, which can be divided into hard solder and soft solder according to the melting point, tin-lead solder, silver solder and copper solder according to the composition. In tin soldering process, tin-lead alloy solder is commonly used, tin-lead alloy solder is used for wire head welding of A, B and E insulation grade motors, and pure tin solder is used for F and H grade motors.
(1) Sn-Pb solder is a commonly used Sn-Pb alloy solder, commonly known as solder, mainly composed of tin and lead, but also contains antimony and other trace metal components.
(2) Eutectic solder - refers to tin-lead solder with eutectic composition. The alloy composition is 61.9% tin and 38.1% lead. In practice, the solder containing 60% tin and 40% lead is called eutectic solder. In tin and lead alloys, except pure tin, pure copper and eutectic components melt at a single temperature, other alloys are melted in one region, so eutectic soldering tin is the best kind of tin solder.
The solder is usually processed according to the specified size in use. It has many shapes and classifications, such as sheet, block, rod, band and filament.
Wire solder is usually called tin wire. The center is covered with rosin flux. It is called rosin-cored wire. It is often used to solder iron and tin by hand. The outer diameter of resin-cored wire is usually 0.5mm, 0.6mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm and 2.3mm.
Flake solders are commonly used in the welding of silicon wafers and other flake weldments.
The strip solder is often used in the production line of automatic assembly chip. The strip solder is cut from the strip solder by an automatic welding machine to improve the production efficiency.
Solder paste is made by mixing solder and flux powder together. Solder paste is first coated on printed circuit board and then welded. It has been widely used in automatic mounting process.
