If a welded joint is designated B-U2-S, which welding process type is indicated?

The designation B-U2-S refers to a specific welding specification and provides critical information about the joint type, the configuration, and the welding process. In this designation, the "B" indicates a butt joint, "U" signifies that it is a welded joint, "2" refers to the type of joint preparation, and "S" denotes the use of a socket joint or similar configuration.

When it comes to the welding processes, Submerged Arc Welding (SAW) is notably characterized by its application in making butt joints, especially in thicker materials. It employs a granular flux that covers the weld pool and keeps it shielded from atmospheric contamination, which makes it ideal for the types of joints specified in these designations.

SAW is often chosen for its efficiency and ability to produce high-quality welds in butt joints with limited need for post-weld cleaning. The characteristics of the joint type and configuration align closely with the use of Submerged Arc Welding, which is why this is the correct answer in this context.