Abstract
Ultrasonic peening (UP) is a method that has been increasingly used in recent years to improve the fatigue strength of welded joints and structures. This study investigated the fatigue strength of butt-welded AA5086-H32 aluminum alloy plate specimens and the effects of ultrasonic peening under atmospheric and corrosive conditions. Exfoliation, intergranular, and electrochemical corrosion tests were also conducted further to analyze the effects of ultrasonic peening on corrosion behavior. Results demonstrated that the peening treatment enhanced the fatigue strength in air and corrosion conditions. The improvement can be attributed to surface layer hardening and applying compressive residual stresses to reduce stress concentration. Peening treatment also reduces corrosion sensitivity through surface hardening.

Key words
ultrasonic peening, corrosion fatigue strength, AA5086-H32 aluminum alloy, butt weldment, intergranular corrosion, electrochemical corrosion

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