What method must be used to join copper tubing according to the relevant code section?

The correct method to join copper tubing according to the relevant code section is brazing. This process involves joining metal components by melting and flowing a filler metal into the joint. The temperature used in brazing is higher than that of soldering, which often makes it a preferred choice for copper tubing, especially in applications requiring greater strength and durability, such as in refrigeration and plumbing systems.

Brazing allows for the creation of strong, heat-resistant joints that can withstand varying pressures and temperatures, making it suitable for long-lasting installations. Additionally, brazed joints tend to have lower leak rates compared to other methods, contributing to the overall reliability of the system.

While soldering is a common method of joining copper, it is not as strong or suitable for certain high-pressure or high-temperature applications. Welding typically involves melting the base metals together, which is not suitable for thin copper tubing and can result in warping. Crimping, on the other hand, is a mechanical method that can also be used for joining, but it does not provide the same level of permanence and strength as brazing.

Understanding the appropriate joining method ensures compliance with mechanical codes and promotes safe and efficient installations in various systems.