The raw materials needed for sheet-metal manufacturing are widely-available, inexpensive, and provide widely variable desired properties. The processes for forming include punching, cutting, rolling, stamping, and deep-drawing. Post-processing includes fittings, flow-forming, welding, and industrial-grade options for weatherproofing. The benefits are sheet-metal design is the ability to embed many features in a single part without incurring significant cost increase.
Once processes and part features are verified to work and tuned as necessary, the manufacturing process can quickly churn out massive amounts of parts in a very short amount of time. Units per hour on the scale of injection molding processes can be achieved.