Viva Questions and Answers of Brazing
Q1. What is brazing?
A: Brazing is a type of metal joining process where two or more metal parts are joined together by heating and flowing a filler metal into the joint. The filler metal has a melting temperature lower than that of the base metal, allowing it to flow and fill the gap between the parts, and then solidifying to form a strong bond.
Q2. What are the benefits of brazing over welding?
A: Brazing offers several benefits over welding, including:
- The ability to join dissimilar metals
- Lower heat input, reducing the risk of warping or damaging the base metal
- No need for cleaning or prepping the base metal prior to joining
- Ability to join thin or delicate parts
- Better control over the filler metal distribution
Q3. What is the difference between brazing and soldering?
A: Both brazing and soldering are metal joining processes that use filler metal to bond two or more parts together. The key difference between the two is the temperature at which they are performed. Soldering is performed at temperatures lower than 450°C, while brazing typically occurs at temperatures between 450°C and 900°C.
Q4. What materials can be brazed?
A: A wide range of metals can be brazed, including steel, copper, aluminum, brass, nickel, and others. The choice of filler metal will depend on the type of base metal being joined and the desired properties of the joint.
Q5. What is the role of flux in brazing?
A: Flux is used in brazing to remove surface oxides and other impurities from the surface of the base metal, improving the wettability of the filler metal and promoting a clean, strong bond.
Q6. Can brazing be performed in a vacuum?
A: Yes, brazing can be performed in a vacuum. This is often done to prevent oxidation and improve the quality of the brazed joint, especially in aerospace and high-temperature applications.
Q7. What are the different types of brazing methods?
A: Some of the most common brazing methods include torch brazing, induction brazing, furnace brazing, resistance brazing, and diffusion brazing.