What technique is used in sectioned drawings to indicate solid material?

In sectioned drawings, hatched lines are used to indicate solid material. This technique involves filling the sectioned area with parallel lines in a specific pattern, which visually distinguishes solid materials from unsectioned areas. The pattern and angle of the hatching can also convey important information about the type of material depicted, whether it's metal, wood, or another substance. This method enhances clarity in technical drawings, ensuring that anyone reviewing the document can easily interpret the design intentions and layout.

Solid lines, while crucial in defining the edges and boundaries of objects in a drawing, do not indicate sectioned areas or the composition of materials. Dotted lines are typically used to represent hidden edges or features, and wavy lines might denote specific types of materials or effects but are not standard for indicating solid sections in engineering drawings. Thus, hatched lines are the established method employed in sectioned drawings for this purpose.