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Flux is usually a mixture of rosin as the main component, which is an auxiliary material to ensure the smooth progress of the soldering process. Welding is the main process in electronic assembly. Flux is an auxiliary material used in welding. The main function of flux is to remove the oxides on the surface of the solder and the base material to be welded, so that the metal surface can reach the necessary cleanliness. It prevents The re-oxidation of the surface reduces the surface tension of the solder and improves the soldering performance. The performance of the flux directly affects the quality of electronic products.