Modern-day forging works on the same principal as it did hundreds of years ago. Heat up the material, then shape it using extreme force. This video shows however how far the technology has moved since a muscly blacksmith in leather apron forged all the weapons and other metal objects.
Using machinery such as these awesome pneumatic hammers it is possible to relatively quickly and efficiently to produce sophisticated metal objects, used in construction and other industries.
Not to mention that watching these things hammer metal into shape is strangely satisfying, and mesmerising!