Is a comparatively recent and promising technology that is based on the use of High Power Ultrasound (HPU). In most industrial applications, HPU involves power levels of hundreds to thousands of watts, and ultrasonic systems are operating in the frequency ranges from 15 kHz to 100 kHz with typical amplitudes range from about 10 to 40 microns.
The development of the Ultrasonic Peening (UP) technology was a logical continuation of the work done before directed on the investigation and further development of known before techniques for surface plastic deformation such as shot peening and hammer peening. During the different stages of its development the UP process was also known as “ultrasonic treatment” (UT), “ultrasonic impact technique/technology/treatment” (UIT) and ultrasonic impact peening (UIP)
See the historical review on UP in IIW Document XIII – 2010 – 04
The UP produces a number of beneficial effects in metals and alloys. Foremost among these is increasing the resistance of materials to surface-related failures, such as fatigue and stress corrosion cracking. One of the promising ways of industrial application of UP is the post-weld treatment of welded elements and structures. The results of fatigue testing showed that the UP is the most efficient and economical technique for fatigue life improvement of welded elements and structures as compared to the existing improvement treatments such as grinding, TIG-dressing, shot peening, hammer peening etc.