Fabrication uses semi-finished or raw materials to make something from start to finish, as opposed to simply assembling it. This work is typically completed by a fabrication shop (or fab shop) that will bid on the contract for the job based on engineering drawings and specifications.
Fabrication means changing the form of the metal from sheets to different forms that various industries use. These units work with different metals, but they mainly use steel and aluminum because of their strength and other properties.