Computerized Complex for Ultrasonic Peening of Parts and Welded Elements

An advanced computerized complex for Ultrasonic Peening (UP) of parts and welded elements based on piezoelectric transducers was developed recently. The complex consists of a compact ultrasonic transducer, generator and a laptop with an Expert System for UP optimum application: maximum possible increase in fatigue life of parts and welded elements with minimum cost, labor and power consumption. Application of UP treatment may increase/restore the designed stress range of welded elements up to the fatigue strength of the base material. The increase of fatigue life by UP is achieved mainly by relieving of harmful tensile residual stresses and introducing of compressive residual stresses into surface layers of metals and alloys, decrease in stress concentration of weld toe zones and the enhancement of the mechanical properties of the surface layer of the material.