What is the method used for joining soft copper tubing?

The appropriate method for joining soft copper tubing includes a variety of techniques: soldering, brazing, compression fittings, and flare fittings. Each of these methods has its own applications and advantages, making them suitable in different contexts.

Soldering involves melting a filler metal that has a lower melting point than that of the workpieces, which is commonly used for joining copper in plumbing applications. Brazing is similar to soldering but typically uses a higher melting point filler metal, providing a strong joint suitable for higher pressure applications. On the other hand, compression fittings do not require heat; they rely on a mechanical connection that compresses the fitting onto the tubing, making them easy to install and often reusable. Flare fittings are another mechanical method where the end of the tubing is flared outward and then connected to a fitting, creating a tight seal.

The use of these different methods allows for flexibility in joining soft copper tubing depending on the requirements of the task, such as the environmental conditions, type of fluids being transported, and ease of installation. This combination of joining techniques highlights why the answer includes all four methods.