What does the forging process do to the source metal?
The forging process results in a variety of changes within the properties of the source metal. A forging process that requires drawing out the metal results in increased length and a decrease in the cross-section. Upsetting the metal results in the opposite, decreased length and an increase in the cross-section. Squeezing metal in closed impression dies results in a change in length, a change in the cross-section, and an overall favorable grain flow.