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by disinfoniacs #69 & #1
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Soldering is a process of permanently joining two or more metal parts by melting a filler metal called solder that is placed between the parts to be joined. Soldering creates an electrical and mechanical bond between the parts, which is crucial in electronic circuits. The most commonly used solder is a combination of tin and lead, with various percentages of each element depending on the specific application.
When soldering for radio and electronic use, it is important to use rosin-core solder, which is a type of solder with a core of rosin or flux. The rosin helps to clean the surfaces of the parts being joined, improving the electrical connection and making the joint more reliable over time. Acid-core solder should never be used in electronic applications because it contains hydrochloric acid, which can corrode electronic components and cause long-term damage to the circuit.
Good solder joints are shiny and smooth, with a concave shape that indicates a proper amount of solder was used. A bad solder joint, on the other hand, often referred to as a cold tin-lead solder joint, will have a rough or lumpy surface and may not provide a reliable electrical connection. It is important to ensure that the parts being joined are clean and free of any corrosion or oxidation before attempting to solder them together. Proper heating of the joint is also critical to ensure a good connection and to prevent overheating, which can damage the components being soldered.
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