Which term refers to the process of joining two sections of pipe together?

The term that refers to the process of joining two sections of pipe together is welding. Welding involves the application of heat to melt the pipe material at the joint, effectively fusing the two sections into one solid piece. This method provides a durable and strong connection that can withstand pressure and environmental factors, making it a common choice for applications involving metal pipes.

Other terms present in the choices describe different methods or components involved in piping systems. Fittings are components used to connect different pieces of pipe without involving melting, while coupling specifically refers to a type of fitting that connects two pipe ends. Soldering, on the other hand, is a technique typically used for joining copper pipes with a filler metal but is not as strong as welding for many applications. Each of these terms is relevant in the context of piping, but welding specifically denotes the process of joining the materials through fusing.