Some of the most common fabrication methods are stamping, punching, folding, cutting, and welding. Stamping uses a set of dies under high pressure to form sheet metal into three-dimensional shapes. Punching uses a punch and die to create holes of a particular size and shape in sheet metal. Folding uses a press brake to crease or fold sheet metal. Cutting uses shears, blades, lasers, water, or a CNC plasma table to cut the metal to a particular size and shape. Welding uses high voltages to join two pieces of metal together by melting a filler material that bonds to both surfaces. Other fabrication methods include machining, rolling, and stretching.