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What is tin bar? The role of tin bar?

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Update time : 2022-09-07 10:49:27
Tin bar is a solder product. There are two types of tin bars: leaded tin bars and lead-free tin bars, both of which are used for circuit board soldering. Made of pure tin, good wetting and fluidity, easy to tinplate. The solder joints are bright and full, and there will be no welding and other undesirable phenomena. Add enough antioxidant elements, strong antioxidant ability. Made of pure tin, reducing tin dross and reducing unnecessary waste.
A tin bar, as the name suggests, is a strip of tin solder. Mainly used for wave soldering and dip soldering, it is currently the most variety of electronic solder consumed; a small amount is also used for flame brazing or soldering Iron welding of large structural parts and long seams. It is the most important and indispensable connecting material in all electronic, electrical and other products, with an annual global consumption of about 100,000 tons.
In addition to the main elements tin, lead, copper and silver, tin bars usually contain small amounts of other elements such as nickel, antimony, bismuth, indium, rare earths, etc. These trace alloying elements in the tin bar have a great influence on the physical and mechanical properties of the tin bar: bismuth can reduce the melting temperature of the tin bar and improve the wettability and spreadability, but if the addition is too large, it will reduce the solder joint. Fatigue life and plasticity. A suitable amount of bismuth is about 0.2 to 1.5%. Nickel can improve the mechanical properties and fatigue life of solder joints by altering the alloy structure and refining the grain. In the chemical composition of the system design, the designer obviously wants the best balance of properties of the tin bar, such as welding performance, melting temperature, strength, plasticity and fatigue life.
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