What gas is typically used when connecting ACR tubing?

Nitrogen is the gas commonly used when connecting ACR (Air Conditioning and Refrigeration) tubing. It serves several important purposes in the process. One of the primary reasons for using nitrogen is that it helps to prevent oxidation and contamination inside the tubing during welding or brazing operations. When the metal is heated, nitrogen creates an inert atmosphere that reduces the risk of forming oxides, which could weaken the joints and affect the overall performance of the refrigeration system.

Additionally, nitrogen can also be used for pressure testing the system before it is put into operation. By pressurizing the system with nitrogen, technicians can check for leaks and ensure that the connections are secure. This preventive measure is vital in maintaining the integrity of the refrigeration system, ensuring it operates efficiently and safely.

While other gases like oxygen, argon, and helium are used in various welding and industrial applications, they do not provide the same protective qualities as nitrogen when it comes to ACR tubing connections. Oxygen can lead to oxidation, while argon and helium are generally used for different types of welding processes.