Which of the following is an example of a permanent joint?

Welding is an example of a permanent joint because it involves the process of fusing materials together at a molecular level, typically using heat. This creates a strong, inseparable bond between the components, making it a permanent solution for joining materials like metals. Unlike other joining methods, such as nuts and bolts or threaded fastenings, welding cannot easily be undone without damaging the materials themselves.

In contrast, nuts and bolts, threaded fastenings, and snap fittings are all considered non-permanent joints. These types of connections can be disassembled, allowing for ease of maintenance or replacement of parts. Permanent joints, like welding, are typically chosen for their strength in applications where a long-lasting bond is essential, such as in structural components or heavy equipment.