Ultrasonic joining (U-Joining/USJ) is a new direct assembly technique developed by Helmholtz-Zentrum Geesthacht that uses ultrasonic energy to join fiber-reinforced thermoplastics to surface-structured metallic parts produced by metal injection molding.

Materials Letters Volume 170, 1 May 2016, Pages 1-4 [Ultrasonic joining: A novel direct-assembly technique for metal-composite hybrid structures]