HOW IS LIGHT GUAGE STEEL FRAMING CREATED?

steel-roll Steel arrives at the forming station as a roll of flat zinc-coated steel.
forming1 The forming station forms the steel into the desired shapes and sizes (similar to lumber used for framing). The main difference is that each shape is square and true.
rollers Each steel framing member is formed using a process called roll forming which passes the sheet steel through a series of rollers and dies to form the bends that shape the web, flanges, lips, or C-shape required. This heatless process known as "cold forming" results in studs and joists that are much stronger than the original sheet steel. 
panels1 Walls, trusses, floors, etc. are assembled in the warehouse, clearly labeled, packaged and prepared for shipment to the jobsite.  panels2
Making a steel frame.