Flux plays a vital role in brazing by protecting the metal from oxidation, dissolving existing oxides and contaminants, and helping the molten filler metal flow smoothly into the joint. Some fluxes also provide a visual indication when the proper brazing temperature has been reached. Without flux, oxides can build up on the surface, preventing proper wetting and resulting in weak or unreliable joints.

During the brazing process, flux melts at approximately 50°C below the melting temperature of the brazing filler metal. It then forms a protective film in the gap between the base metal and the filler metal, preventing oxidation of both materials and improving bonding performance. In particular, when using powdered brazing materials, mixing Sunkwang AMPA powder with the proper amount of flux and applying it to the brazing area helps prevent pinholes and overheating of the base metal, thereby ensuring excellent brazing quality.

Caution

• Always work in a well-ventilated area.
• Avoid breathing in fumes or gases produced during brazing.
• After brazing, clean off any residue with hot water, pickling, or mechanical methods.