Fluxes Veerankutty ME S4 NO: 56

Functions of Flux Remove any oxides that form as a result of heating the parts Promote wetting Aid in capillary action

Flux in General When heated to its reacting temperature must be thin and flow through the gap provided at the joint As it flows through the joint it absorbs and dissolves oxides, allowing the molten filler metal to be pulled in behind it. Once the joint is complete the flux material should be completely removable

Types of Fluxes Solids Powders Paste Liquids Sheets Rings Washers They are also available mixed with filler metal, inside the filler metal or on the outside of filler metal

Fluxing Action Will remove light surface oxides, promote wetting, and aid in capillary action But they do not eliminate the need for good joint cleaning Flux will not remove oil, dirt, paint, glue, heavy oxides or other surface contaminants

Soldering & Brazing Fluxes Soldering Fluxes are chemical compounds such as Muriatic acid (hydrochloric acid) Sal ammoniac (ammonium chloride) Rosin Brazing Fluxes are chemical compounds such as Fluorides Chlorides Boric acids Alkalies

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