Hammering is a technique of forming or straightening workpieces or increasing their strength and hardness by means of well-aimed hammer blows on sheet metal and sections.
Figure 1 Hammering
It is used in single-piece production only, in special industries and trades or repair work.
Special hammering techniques are: lengthening, curving, chasing, flanging.
Marking is a technique of punching - by means of hammers and special marking punches - letters, figures or texts into the surface of workpieces for the purpose of identifying workpieces, giving sequences for assembly operations or durably noting down dates of manufacture.
Figure 2 Marking
In modern batch or mass production such operations are performed on special machines by means of pressing, deep-drawing, bending and embossing tools