The purpose of purging air conditioning systems while brazing is to ____________________.

The purpose of purging air conditioning systems while brazing is to prevent oxidation. When brazing, the presence of air (especially oxygen) in the system can cause oxidation on the metal surfaces being joined. Oxidation can prevent proper bonding between the materials, leading to weak joints and potential leaks. By purging the system, typically with an inert gas like nitrogen, it displaces the air, thereby minimizing the likelihood of oxidation occurring during the brazing process. This ensures a cleaner environment for the brazing operation, leading to stronger and more reliable joints in the refrigeration system.