The principle of soldering is a process in which a solid solder wire is heated and melted by a heated soldering iron, and then flows into the metal to be soldered with the help of flux, and forms a firm solder joint after cooling. When the solder is a tin-lead alloy and the soldering surface is copper, the solder first wets the soldering surface. With the wetting phenomenon, the solder gradually diffuses into the metal copper, forming an adhesion layer on the contact surface of the solder and the metal copper, so that both Combine firmly.
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