Welding is an essential step in the production and application of connectors. This is because the cleaned surface of weldments is always oxidized quickly when heated and welded to form a solder resist layer, so flux must be used. It can not only clean the oxide, isolate oxygen and prevent reoxidation, but also reduce the surface tension of liquid solder, increase its fluidity, make the surface of solder joint smooth and beautiful, and the interior of solder joint dense. Rosin is a commonly used flux, which has the following characteristics:
1. Low corrosivity: rosin is neutral and will not corrode connector pins and soldering iron heads;
2. Removal of oxide film: rosin can react with other substances in the flux to remove the oxide film;
3. Prevent reoxidation: after rosin melts, it floats on the solder surface to form an isolation layer, which can prevent reoxidation of the welding surface;
4. Reduce the surface tension of solder: it can increase the fluidity of solder and help solder wet the plate;
5. Reduce the probability of false soldering: the rosin melts to make the solder joint more substantial, so as to reduce the probability of false soldering;
6. Make the solder joint more bright and full.
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