Final answer:
The main purpose of an assembly drawing is to show how the parts are assembled, not specifically how they are welded, machined, or fabricated. Therefore correct answer is option A.
Step-by-step explanation:
The primary function of an assembly drawing is to illustrate the arrangement and connection of individual components in the assembled structure. In engineering, assembly drawings are critical as they provide a comprehensive layout that details how different components fit together. Unlike welding, which is the process of joining materials through the application of heat and using solder, an assembly drawing does not depict the welding process specifically, but rather the overall structure and order of assembly.
Machining and fabrication are other processes that are related to manufacturing and creating components. Machining refers to processes that cut away material to shape the part, while fabrication encompasses various methods of creating the components, including welding. However, when it comes to assembly drawings, their primary focus is on how the machined and fabricated parts are constructed into a final product.