Class 5 Boiler Practice Exam 2025 – The Comprehensive All-in-One Guide to Exam Success!

The correct response identifies a term that differs in definition from the others. In welding terminology, a "fillet weld," "butt weld," and "lap weld" refer specifically to types of welds that are commonly used in various applications for joining metal components.

A fillet weld is used to join two surfaces at a right angle, typically used in corner joints. A butt weld is employed to join two pieces of metal along their edges and is often used when the pieces need to be aligned on the same plane. A lap weld involves overlapping two pieces of metal and welding them together at the overlapping edges.

While "socket" can describe certain types of connections and fittings, it is not classified as a weld. The socket connection typically refers to how parts fit together, particularly in pipe applications, rather than a method of metal fusion like the others. Thus, the recognition of "socket" as not being a weld type distinguishes it from the others, making it the exception in this list.