What's is ultrasonic impact treatment

Ultrasonic impact treatment (UIT) is a relatively novel technique applied to the toe of welded joints to improve the fatigue life by changing the weld geometry and the residual stress state. In this study, the stress relaxation due to ultrasonic impact treatment is investigated on a six pass welded high strength quenched and tempered steel section. Stress measurements in two orthogonal directions were conducted by energy dispersive synchrotron X-ray diffraction. Results show that the application of only ultrasound to a welded component re-distributes the residual stresses more uniformly, while mechanical impacts in combination with ultrasound is an effective way to release the residual stresses. After welding, diffraction peak broadening due to the lattice distortion, characterised by the full width at half maximum (FWHM), is observed in the region of the weld toes. Ultrasonic impact treatment reduces the FWHM at these locations. 

Shot Peening Equipment by Ultrasonic Impact Treatment technology allows the use of high quality media. Quality madia combined to the real-time control of parameters, ensures a repeatable and efficient treatment. Ultrasonic Shot Peening (USP) induces a low roughness and a better surface quality compared to the conventional shot peening. This has a direct influence on fatigue-life enhancement and prevent Stress Corrosion Cracking.

Parameter:

Application:

• Inscreasing productivity and quality

• Cost reductions

• Improving fatigue life

• Treatment of complex geometry parts

• Process control and repeatability

• Low roughness (see image above)

• Shorter treatment cycle time

• Reducing consumption of beads, energy and compressed air

• Integration in the production line (lean manufacturing)

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