Flux

Flux is a mixture mainly composed of rosin, supplemented by solvents, and added with many active agents, which is an auxiliary material to ensure the smooth progress of the welding process. The proportions of various components are different and their functions are different, which can meet the requirements of all welding products and processes.

kind

01. Inorganic soldering flux

Inorganic series fluxes have strong chemical effects and excellent soldering performance, but they have a strong corrosive effect and belong to acidic fluxes.

02. Organic soldering flux

The soldering effect of organic series flux is between inorganic series flux and resin series flux, and it also belongs to acidic and water-soluble flux. Water soluble fluxes containing organic acids are based on lactic acid and citric acid, and their welding residues can remain on the welded object for a period of time without severe corrosion.

03. Resin flux

Its main component is rosin, which is also known as organic solvent flux because it can only dissolve in organic solvents.

effect

1. Dissolve the oxide film of the weld mother

In the atmosphere, the surface of the welded base material is always covered with an oxide film. During welding, the oxide film will inevitably prevent the solder from wetting the base material, and welding cannot proceed normally. Therefore, it is necessary to apply flux on the surface of the base material to reduce the oxide on the surface of the base material, thereby achieving the goal of eliminating the oxide film.

2. Re oxidation of welded base metal

The base material needs to be heated during the welding process, and the metal surface will accelerate oxidation at high temperatures. Therefore, liquid flux covering the surfaces of the base material and solder can prevent them from oxidizing.

3. Tension of molten solder

The surface of molten solder has a certain tension, just like rainwater falling on lotus leaves. Due to the surface tension of the liquid, it will immediately coalesce into spherical water droplets. The surface tension of molten solder will prevent it from flowing towards the surface of the base material, affecting the normal wetting process. When the flux covers the surface of the molten solder, it can reduce the surface tension of the liquid solder and significantly improve the wetting performance.

4. Protect the welding base material

The welded material has damaged the original surface protective layer during the welding process. Good soldering flux quickly returns to its protective function after soldering. Can accelerate the transfer of heat from the soldering iron tip to the solder and the surface of the object being soldered; Appropriate soldering flux can also make solder joints aesthetically pleasing.

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