brazer resistance Interview Questions and Answers

1. What is brazer resistance?

   • Answer: Brazer resistance refers to the ability of a brazed joint to withstand mechanical forces and stresses without failure. It encompasses factors like tensile strength, shear strength, fatigue resistance, and creep resistance.

2. How does brazing filler metal affect brazer resistance?

   • Answer: The filler metal's composition, melting point, and flow characteristics significantly impact brazer resistance. A strong, ductile filler metal with a good metallurgical bond to the base metals will result in higher resistance.

3. What is the role of base metal in brazer resistance?

   • Answer: The base metals' compatibility with the filler metal, their cleanliness, and their own mechanical properties all influence the joint's overall resistance. Poor base metal preparation can lead to weak joints.

4. Explain the importance of proper joint design in achieving high brazer resistance.

   • Answer: Joint design is crucial. A well-designed joint ensures adequate capillary flow of the filler metal, minimizing stress concentrations and maximizing the contact area between the base metals and the filler metal for optimal strength.

5. How does brazing temperature influence brazer resistance?

   • Answer: Too low a temperature may result in incomplete melting and poor flow of the filler metal, leading to weak joints. Too high a temperature can cause excessive grain growth or damage to the base metals, also reducing resistance.

6. What are some common methods for testing brazer resistance?

   • Answer: Common tests include tensile testing, shear testing, fatigue testing, and creep testing. The choice of test depends on the intended application and the type of stresses the joint will experience.

7. How does surface preparation affect brazer resistance?

   • Answer: Clean, oxide-free surfaces are essential for good wetting and a strong metallurgical bond. Improper cleaning can lead to weak joints with poor resistance.

8. What is the effect of brazing atmosphere on brazer resistance?

   • Answer: A controlled atmosphere can prevent oxidation and other reactions that could weaken the brazed joint. Inert or reducing atmospheres are often preferred.

9. How does the brazing time affect the resulting joint's resistance?

   • Answer: Sufficient time is needed for complete melting and flow of the filler metal, ensuring good penetration and bonding. However, excessively long times can lead to undesirable effects, such as grain growth or oxidation.

10. Describe the importance of flux in brazing and its effect on brazer resistance.

    • Answer: Flux removes oxides and contaminants from the base metal surfaces, promoting wetting and ensuring a strong bond between the filler metal and the base metals, thus improving brazer resistance.

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