NATE Air Conditioning and Heat Pumps Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Complete your NATE Air Conditioning and Heat Pumps Test. Get ready with flashcards and multiple choice questions, all with detailed hints and explanations. Achieve success on your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which brazing material is acceptable for use on refrigerant piping?

50/50 soft solder with an approved flux
95/5 soft solder with an approved liquid flux
95/5 soft solder with an approved paste flux
Brazing alloy with an approved flux

The correct answer is: Brazing alloy with an approved flux

In refrigerant piping applications, it is essential to use materials that can withstand the pressures and temperatures involved while maintaining a strong, leak-proof joint. Brazing alloys are specifically designed for high-strength applications and are suitable for use with refrigerants due to their ability to create strong, durable connections. Brazing requires the use of a filler metal that has a melting point above 842°F (450°C) and combines with the base metals through processes of capillary action and diffusion, resulting in a joint that is well-suited to handle the stresses of refrigerant flow. The approved flux used in conjunction with a brazing alloy helps to prevent oxidation and allows for better flow of the filler metal, leading to a more effective and reliable bond. In contrast, soft solders (like those mentioned in the other options) typically have lower melting points and may not provide the same level of structural integrity required for refrigerant lines, especially in high-pressure systems. Therefore, the use of a brazing alloy with an appropriate flux stands out as the correct choice for ensuring the integrity and reliability of refrigerant piping connections.