What welding method is typically used for joining pipes that are 2 inch nominal size or smaller?

The socket weld method is commonly used for joining pipes that are 2 inches nominal size or smaller due to its suitability for applications where space is limited and the risk of the joint being exposed to stresses is lower. This welding technique involves inserting one pipe into another—typically involving a slightly larger diameter pipe—and then welding the joint around the circumference of the socket.

This method is advantageous because it creates a smooth internal surface, which minimizes turbulence and pressure loss in the flow of fluids through the pipes. Additionally, socket welding is easier to perform in tight spaces, making it a preferred choice for smaller diameter piping systems often found in various industrial applications.

Other welding methods like the butt weld method may provide stronger connections but are more difficult to execute on smaller pipes, particularly those that are 2 inches or less. The tee weld method and fillet weld method, while applicable in some contexts, do not offer the same level of structural integrity and design compatibility for small pipe connections. Therefore, the socket weld method stands out as the most practical and effective choice for this specific application.