Question
Download Solution PDFIn a brazing operation, which of the following is the commonly used flux?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- 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.
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