Aluminium alloy extruded profiles can easily produce various complex cross-sectional structures which cannot be produced by steel. As one of the effective means for automotive lightweight, aluminium profiles are widely used as structural materials in various parts of automobiles, including bumper crash beams, energy absorption boxes, door crash beams, instrument panel brackets, chassis components, body structural components, oil pipes, guide rails, luggage racks, heat exchanger, battery support plates and brackets, magnetic levitation motor shells, car skylights, etc.