This is a specific process for joining various metal parts together by welding them. These elements (thin or thick sheets, profiles, tubes) are cut and prepared before welding.The machining is then carried out on machine tools. The welded materials are generally steel, aluminum, titanium, stainless steel and more rarely copper and its alloys. Mechanical welding is most often used for the production of large structures, or handling systems such as elevators or manipulator arms.