Provided herein are methods of joining metal products without fracturing the metal products, including electrically treating (for example, electrically aging) the metal products and pierce-fastening the metal products or hemming the metal products. In some examples, electrically aging the metal products includes locally heating a joining point of the metal products and decreasing an activation energy of atoms within the metal products, thus controlling the kinetic activity of atoms within the metal products.
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Devanathan, Shreyas; Lester, Patrick; Talla, Rajasekhar; Mohanty, Rashmi; and Malpica, Julio, "Electrically Treated Metal Products and Methods of Making the Same", Technical Disclosure Commons, (July 02, 2020)