sheet metal fabrication is metal formed by an industrial process into thin, flat pieces. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. Countless everyday objects are fabricated from sheet metal. Thicknesses can vary significantly; extremely thin sheets are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate steel or "structural steel.
For sheet metal working,there are bending, riveting, flanging, spot welding, convex hull, step difference, sometimes the nut or stud should be pressed after bending one or two times.
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