Aluminum Alloy 2024 Aluminum Alloy 2024 is an aluminium alloy, with copper as the primary alloying element. It is used in applications requiring high strength to weight ratio, as well as good fatigue resistance. It is weld able only through friction welding, and has average machinability. It is an alloy that is often used in the aerospace industry. It is a high-strength alloy suitable for projects requiring a high strength-to-weight ratio and excellent fatigue resistance. It has the property to be welded but only through friction welding. The Aluminum Alloy 2024 is very effective and has many properties making it suitable for a number of industries.