Weld detail fatigue life improvement techniques. Part 1: review

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

“…In Fig. 5 a) The fatigue strength of the welded joints is strongly affected by the residual stress field in the weld toe region [11,16]. Fig.…”

“…Techniques such as: TIG and plasma dressing, burr grinding, needle, shot and hammer peening have been studied in last decades and reported in numerous papers [7][8][9][10][11]. More recently, some attention has been placed on the investigation of high frequency peening treatment, referred to as ultrasonic impact treatment or as ultrasonic peening, that has proved to be an efficient way for fatigue life improvement [12,13].…”

“…More recently, some attention has been placed on the investigation of high frequency peening treatment, referred to as ultrasonic impact treatment or as ultrasonic peening, that has proved to be an efficient way for fatigue life improvement [12,13]. The published results indicate, in general, large increases of fatigue strength by using these techniques [1,7,11]. TIG and plasma dressing are important industrial techniques, which produce more effective benefits than grinding [11].…”

“…The published results indicate, in general, large increases of fatigue strength by using these techniques [1,7,11]. TIG and plasma dressing are important industrial techniques, which produce more effective benefits than grinding [11]. However, the efficiency of these processes seems to be lower than hammer and ultrasonic penning [7,11].…”

“…TIG and plasma dressing are important industrial techniques, which produce more effective benefits than grinding [11]. However, the efficiency of these processes seems to be lower than hammer and ultrasonic penning [7,11]. The fatigue strength improvement achieved through these techniques, increases with nominal yield stress and therefore the greatest benefits are obtained for high strength steels [7,9,12,14,15].…”