NOCTI Welding Practice Test

The symbol that indicates a weld extending completely around a joint is the circle. This symbol suggests that the weld should encircle the joint entirely, ensuring a continuous and robust connection. In welding practices, a complete joint penetration is often required for structural integrity, and using the circle symbol effectively communicates this requirement.

In contrast, the other symbols convey different meanings in welding notation. The triangle may be used to depict a weld that has specific characteristics, such as a conical or tapered edge, while the square generally represents a corner weld, indicating that the weld is located at a right angle joint. The semicircle generally signifies a specific type of weld, such as a plug or slot weld, that does not extend around the joint. Thus, the circle is the only symbol that distinctly implies a complete wrap around the joint, making it the correct choice for this question.