In a brazing operation, which of the following is the commonly used flux?

In a brazing operation, which of the following is the commonly used flux? Correct Answer Borax

Explanation:

• Brazing is the joining of metals through the use of heat and a filler metal whose melting temperature is above 450°C but below the melting point of the metals being joined.
• Brazing is welding process in which filler metal is heated and melted to form flux, which fills the gap between parts to be joined.
• Fluxes used are combinations of borax, boric acid, chlorides, fluorides, tetra‐borates and other wetting agents.
• A popular composition of flux is is 75% borax and 25% boric acid.
• Any form of oxide on the surface of a metal when heated will prevent a uniform flow of the brazing metals.
• For this reason, a flux is necessary to eliminate the oxide.
• A flux is a chemical compound used in brazing operation to dissolve oxides which are formed on the surface of metal and filler rod.
• In brazing operation, Borax is used as a flux.