Correct option is A
Upsetting is a forging operation in which the length of the workpiece is reduced, and its diameter and thickness increase by applying compressive force along the axis. It is commonly used for making components such as bolt heads, rivet heads, and flanges.
This process is performed using a hammer or press, where the workpiece is held in place while force is applied at one end, causing the metal to flow outward.
Key Points:
· Increases the diameter and thickness while shortening the length.
· Used for manufacturing fasteners like bolts and rivets.
· Requires controlled heating to improve metal plasticity.
· Can be done in open-die or closed-die forging processes.
