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Flux is typically a mixture with rosin as its main component, serving as an auxiliary material to ensure smooth welding processes. Its primary function is to remove oxides from the surfaces of the solder and the base materials, achieving the necessary level of cleanliness for metal surfaces. Flux prevents re-oxidation during welding, reduces the surface tension of the solder, and enhances welding performance. The quality of flux directly affects the quality of electronic products.
Characteristics of Flux:
- Wetting (Lateral Flow):
Also known as solder wetting, this refers to the molten solder forming a uniform, smooth, and continuous layer firmly adhered to the metal surface. The degree of wetting primarily depends on the cleanliness of the welded surface and the surface tension of the solder. - Diffusion (Vertical Flow):
Alongside the wetting phenomenon, molten solder also exhibits diffusion into the solid metal, penetrating into the interior of the base material during the welding process.
