3. Folded molten solder tension
The surface of the molten solder has a certain tension, just like rain water falling on the lotus leaf, because the surface tension of the liquid will immediately coalesce into a ball-shaped droplet. The surface tension of the molten solder will prevent it from flowing to the surface of the base metal, affecting the normal progress of wetting. When the flux covers the surface of the molten solder, the surface tension of the liquid solder can be reduced, so that the wetting performance is significantly improved. Our company provides electrode oven.
4. Fold protection welding base metal
The material to be welded has destroyed the original surface protective layer during the welding process. After welding, the good flux is quickly restored to the role of protecting the consumables. It can accelerate the transfer of heat from the tip of the soldering iron to the solder and the surface of the solder; the appropriate flux can also make the solder joint beautiful.
Second, the performance of flux
1. The flux should have an appropriate active temperature range. It starts to work before the solder melts, and it plays a role in removing the oxide film and reducing the surface tension of the liquid solder during the soldering process. The melting point of the flux should be lower than the melting point of the solder, but it is not easy to be too different.
2. The flux should have good thermal stability, the general thermal stability temperature is not less than 100 ℃.
3. The density of the flux should be less than the density of the liquid solder, so that the flux can spread evenly on the surface of the metal to be welded, covering the surface of the solder and the metal to be filmed, effectively blocking the air, and promoting the wetting of the base material wet.
4. Residues of flux should not be corrosive and easy to clean; toxic and harmful gases should not be precipitated; water-soluble resistors and insulation resistors that meet the regulations of the electronics industry; no moisture absorption, no mold generation; stable chemical properties, easy to store.
The above information is provided by gas cutting machine manufacturers.
