Which method is primarily used for joining metal pipes in pressure piping systems?

Welding is the primary method used for joining metal pipes in pressure piping systems because it creates a strong, permanent bond between the metal components. This process involves melting the edges of the metals to be joined and allowing them to fuse together as they cool, leading to a joint that can withstand high pressures and temperatures. Welded joints can be tailored to various conditions, ensuring they meet specific strength and sealing requirements essential in pressure piping applications.

While other methods like adhesive bonding, screwing, and clamping may work for certain applications, they do not provide the same level of strength and integrity as welding does in high-pressure environments. Adhesive bonding is generally more suitable for non-pressurized applications or joints where flexibility and chemical resistance are needed. Screwing is often used for temporary or low-pressure joints, while clamping allows for easy disassembly but may not maintain a secure connection under high pressure.