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A soldering iron is a handheld tool that converts electrical energy into thermal energy to melt solder wire and weld electronic components. Essentially, it is a precision welding device that integrates heating, temperature control, and solder delivery functions. Its working principle is based on Joule's law, using a heating element (such as a soldering iron tip) to quickly heat up to the solder melting point (183-280℃). Heat is conducted through the soldering iron tip to achieve wetting and bonding of the metal surface. It is widely used in electronic repair, circuit board welding, and precision component assembly.
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