Which line indicates the outline of an object?

The visible line is used to represent the outline or edges of an object in a technical drawing. It is depicted as a solid line and provides a clear representation of the object's shape and form. In welding print reading, understanding the outlines is crucial for visualizing how parts fit together and for fabricating components accurately.

Visible lines help differentiate between the actual object and other elements drawn, such as hidden features or reference lines. They stand out as the primary feature in the drawing, allowing welders and engineers to comprehend the design intent at a glance.

In contrast, the other types of lines serve different purposes. Break lines indicate where an object has been interrupted or where a part is not shown in full. Center lines are used to establish symmetry and show the midpoint of geometric shapes, while dimension lines convey measurements and provide information on the size and location of features. Understanding these distinctions aids in interpreting technical drawings effectively.