Question

During brazing joint process, the commonly used flux material is:

• A. Borax
• B. Resin
• C. Lead sulphide
• D. Zinc chloride

Hint:

Borax is preferred due to its high melting point and effectiveness in preventing oxidation during the brazing process.

Answer 1

The Correct Option is A

1. Flux in Brazing:
In brazing, a flux is used to clean the surfaces of the metals to be joined and to prevent oxidation during heating.
2. Why Borax:
Borax is the most commonly used flux for brazing due to its excellent properties of cleaning metal surfaces and its ability to prevent oxidation at high temperatures.
3. Other Flux Materials:
Resin (Option 2) is also used in some applications but is not as common for brazing.
Lead sulphide (Option 3) and Zinc chloride (Option 4) are not typically used in the brazing process.