UMA is an additive manufacturing method that uses ultrasonic welding to join layers of metal foil together to create complex 3D shapes. It is a solid-state welding process in which layers of metal foils are bonded together using high-frequency ultrasonic vibrations rather than traditional heat-based methods. It has the advantage that it can manufacture dissimilar metals and allows small, complex structures to be created with complex geometries. As a result, UAM has several applications in the aerospace, automotive, and medical industries, where the capacity to create complex shapes and structures is critical.