What type of joint is most commonly used for connecting metal pipes?

The most commonly used joint for connecting metal pipes is the soldered joint. This type of joint involves the application of heat to melt solder, which is a filler metal, allowing it to flow into the joint and solidify upon cooling. Soldered joints provide a smooth and strong connection, suitable for various plumbing applications, especially in systems where water flow is involved.

Soldering is prevalent in copper piping systems and is favored for its reliability and resistance to leaks when properly executed. It creates a permanent bond that's capable of withstanding significant pressure. Moreover, soldered joints can be made without the need for additional fittings, which simplifies the installation process and makes it cost-effective in terms of both materials and labor.

Other types of joints, such as flanged, compression, and threaded joints, serve specific purposes in plumbing. Flanged joints are used where a strong, removable connection is necessary, typically in larger piping systems or those requiring disassembly. Compression joints offer a good seal but are more common in connections involving plastic or soft metal pipes. Threaded joints provide a mechanical connection often found in installations that require easy assembly and disassembly.

Understanding the most suitable joint for connecting metal pipes is crucial for ensuring the integrity and efficiency of plumbing systems.