What is the preferred method to join copper ACR tubing?

The preferred method to join copper ACR (Air Conditioning and Refrigeration) tubing is brazing, especially using a filler material such as B Ag 5. Brazing provides a strong, durable joint that can withstand the pressures typically found in refrigeration systems, making it suitable for both high and low-pressure applications. This process involves heating the joint to a temperature above 450 degrees Celsius and using a filler metal that has a lower melting point than the copper itself, allowing for excellent capillary action which ensures that the filler flows into the joint to create a strong bond.

In addition, brazing adds a level of flexibility and strength to the joint that is important in a system subject to thermal expansion and contraction. Favoring brazing also aligns with industry standards and practices for ACR applications, ensuring reliability and performance in the long term.