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

Welded joints are the most commonly used method for joining metal pipes due to their strength and durability. This type of joint involves melting the edges of the pipes together using a heat source, such as an electric arc or gas flame, which fuses the metal, forming a strong, permanent bond once it cools and solidifies.

Welding provides a watertight and gas-tight seal that is essential in applications where pressure and fluid containment are critical, such as in piping systems for plumbing, heating, and industrial processes. This method is particularly preferred in environments where joints are subject to high pressure or extreme temperatures, ensuring the integrity of the system over time.

Other joining methods like compression, glue, and slip-on joints may be suitable for specific scenarios or materials, but they generally do not provide the same level of strength and reliability as welded joints for metal piping applications.