Which of the following designations indicates a single bevel groove weld?

The designation that indicates a single bevel groove weld is represented by TC-U4a. This identification is part of the AWS (American Welding Society) designations that specify the type of weld joint configuration.

In the context of TC-U4a, “TC” stands for “Torsion” and indicates a welded joint that experiences torsional stress. The “U” signifies that it is an unreinforced joint while the “4a” indicates the specific type of bevel groove weld configuration, which in this case is a single bevel.

Understanding these designations is crucial for welding certifications, as they provide a standardized way of identifying different types of joints and their configurations. Each part of the designation has significance in conveying information about the weld type, allowing welders to understand how they should approach the welding process for different design conditions.

The other options represent different types of welds or configurations not related to a single bevel groove weld, focusing instead on other joint classifications or designs that do not specifically indicate the single bevel configuration.