Forging
Forging is one of the oldest metalworking processes. It was normally done by a smith using hammer and anvil. People started using water power in the 12th century. They also started working with iron at that time. Using water power allowed them to use bigger and more powerful hammers.  This allowed the smiths to increased the amount and size of iron that could be forged. The forge has changed over centuries. It has become a place with engineered processes and equipment to handle the needs of modern industry.