Welding together pipes that are 2 inch nominal size or smaller is usually done using:

The correct approach for welding pipes that are 2 inch nominal size or smaller is typically the socket weld method. This technique is particularly suited for smaller diameter pipes as it allows for a strong joint while being simpler and less time-consuming compared to other methods.

Socket welding involves inserting one pipe end into the socket of another pipe before welding, which produces a strong and durable joint for applications where space is limited. This is especially useful in systems requiring a compact connection that can withstand pressure and stress.

Other welding methods, while effective, may not be as practical for smaller pipes. For example, the butt weld method requires aligning and joining two ends together, which can be more challenging in confined spaces or with smaller diameters. Automatic welding machines are typically used for larger pipelines or more extensive systems, where efficiency and speed are priorities. The oxy-acetylene method, while versatile, is less commonly used for pipe welding in smaller sizes due to potential heat distortion and is often reserved for specific applications that require it.

Overall, socket welding not only addresses the practical considerations of working with smaller pipes, but it also ensures integrity and reliability in the connections being made.