Metal fabrication machines shape or cut metal workpieces. Brakes and bending machines fold or crease flat sheets or angles, bars, and tubes. Rolling machines create curves, rolls, beads, or other profile shapes on flat sheets and plates or bars and tubes. Shearing machines leave clean-edged cuts on sheet metal or struts, rods, and bars. Notching and punching machines create notches or holes in sheet metal or pipes and tubes. Shaping machines smooth, curve, and stretch sheet metal and are commonly used to form and finish domed workpieces. Ironworkers and combination machines have multiple stations to perform different metal-forming functions with one machine.