Dr. Ziad Shakeeb Al Sarraf, Dr. Ahmed Fattah Ahmed, and Mr. Khalid Alias Hammo , trans. “Evaluation of Vibration Amplitude Stepping and Welding Performance of 20 KHz and 40 KHz Ultrasonic Power of Metal Welding”. Indian Journal of Production and Thermal Engineering (IJPTE) 1, no. 2 (December 12, 2023): 11–15. Accessed June 28, 2025. https://www.journals.latticescipub.com/index.php/ijpte/article/view/193.