Fatigue life improvement of welded doubling plates by grinding and ultrasonic peening

Effects of ultrasonic impact treatment on pre-fatigue loaded high-strength steel welded joints

“…Other factors for the beneficial effect of UIT are decreasing of stress concentration in weld toe zones and enhancement of mechanical properties of the surface layer [4,8,13,14]. Fatigue testing of welded specimens showed that UP is the most efficient improvement treatment as compared with traditional techniques such as grinding, TIG-dressing, and hamming peening [15][16][17][18].…”

Fatigue strength of normal and high strength steel joints improved by weld profiling

“…Weld profiling is certainly not the most applied for engineering structures, but offers significant benefits compared to other PWT techniques. Most notably, the shape of the introduced weld transition smoothing is easy controllable and quantifiable, which is the reason why it is the most frequently applied method in offshore structures, see [27,30]. Furthermore, it is basically the only technique that is available to smoothed the surface of welded components in structures like turbine runners of yacht keels that require a high surface quality due to hydrodynamic reasons.…”

Effect of high frequency mechanical impact treatment on fatigue strength of welded 1300 MPa yield strength steel

“…High frequency mechanical impact (HFMI) is a recent post weld treatment method which has been employed to increase the fatigue strength of welded components. Several papers have demonstrated the effectiveness of HFMI to improve the fatigue strength of welds [7][8][9][10][11][12][13][14][15][16]. It is believed that the improvement is achieved via modification of the weld toe geometry, induced compressive residual stresses and increased surface hardness in the treated region [15,[17][18][19][20][21].…”