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In this method, a hard metal head with acceleration of several thousand "g" at a frequency of 10 to 100 KHz at range of few microns hits to the surface of the work. By means of cold work the fine grains of the surface of metal piece are improved. In this process compressive residual stresses are produced, whereas harmful residual stresses which are often tensile are released. This operation takes place on critical spots of a component or metal structure such as points exposed to abrasion, dynamic loading and welding joints.


Advantages of ultrasonic peening:
• Fatigue resistance enhancement by up to 3 fold in components exposed to cyclic loading
• Corrosion resistance enhancement
• Mechanical and physical properties improvement such as fatigue and corrosion resistance, surface hardness and wear resistance and toughness enhancement in the weld area
• Release of harmful tensile residual stresses at critical points such as welds, fillets and areas with high stress concentration
• Restoration and improvement of surface cracks by means of generation of compressive residual stresses and prevention of crack expansion on the surface
• Very low energy requirement and ability to run on large components onsite and fully localized
• Ability to run automatically and robotically with high speed operation
• Reduce of maintenance and repair costs by reducing number of failure at critical points and consequently life of components or structures enhancement

• Construction industries: Improvement of metal structures such as bridges, railways and buildings
• Oil and Gas Industries: Improvement of welds in large cranes and offshore oil rigs
• Capability to be applied underwater for repair or life enhancement in piles of bridge , oil platforms and docks
• Reduction of leakage and failure in water, oil and gas pipelines and consequently their life enhancement
• Mineral Industries
• Automotive industries and life enhancement of engine's components

Ultrasonic Burnishing:
The work method is quite similar to the ultrasonic peening method, except that instrument is fixed and the work piece is rotating in front of the ultrasonic head. This operation, by hammering of the surface of the shaft or any other rotating part, improves surface fineness, surface hardness enhancement and, as a result, increases wear resistance.

• Surface fineness enhancement without grinding
• Mining and drilling industries:
o Hardness and wear resistance enhancement in rollers
o Surface fineness improvement and anti-wearing of bearings and seals location in shafts in different industries.
• Aviation Industries
• Oil and Gas Industries

1. International institute of welding (IIW)
2. American Bureau of Shipping (ABS)
3. Lloyd’s Register (LR)
4. American Association of State Highway and Transportation Officials (AASHTO)
5. Federal Highway Administration (FHWA)
6. The American Society of Mechanical Engineers (ASME)