BY ULTRASONIC PEENING

Wang Dongpo   Huo Lixing  Zhang Yufeng

(School of Materials Science and Engineering, Tianjin University, Tianjin 300072)

Ge Zhihai

(Department of Quality Inspection, Shenzhen Chiwan Shengbaowang Engineering Company Limited, Shenzhen 518068)

Abstract: The fatigue contrast tests of Q235B steel unload longitudinal fillet welded joints containing high welding residual stress and in two different state: ultrasonic peening and as welded condition are directed. And the effect on fatigue performance of the welded joints treated by ultrasonic peening from welding residual stress is studied. Test results showed that: the effect on fatigue performance of the welded joints treated by ultrasonic peening from welding residual stress is small. It is safe that use the small specimens which are treated by ultrasonic peening and don’t contain high welding residual stress to appraise the fatigue performance improvement on large-scale welded structures which are as the same junction style and thickness as the small.

Key words: Ultrasonic peening  Welded joint  Fatigue performance  Welding residual stress

CLC No: TG404