Abstract
The application fields of friction stir welding technology, such as aerospace and transportation, has high safety requirements and fatigue is the dominant failure mode for weldments. It is of great significance to understand the fatigue properties of friction stir welded joints. This paper provides an overview of the fatigue mechanism, influencing factors, crack growth rate, and fatigue life assessment. It is found that the fatigue performance of friction stir welded joints can be affected by welding process parameters, test environment, stress ratio, residual stress, and weld defect. The optimized process parameters can produce high quality weld and increase the weld fatigue life. Laser peening is an effective post weld treatment to decrease fatigue crack growth rate and improve material fatigue life.
Highlights
Friction Stir Welding (FSW) is a solid-state welding technology invented by The Welding Institute (TWI), UK, in 1991
The FSW method improved the fatigue performance by ~2.4 times in comparison with the single riveting method commonly used in aerospace, and reduced the overlap area in the double riveting method, while ensuring the fatigue strength and mechanical properties. [9,10,11,12,13,14,15] The main application fields of FSW such as aerospace and transportation have very high safety requirements, and fatigue resistance of a welded joint is of great significance in ensuring overall structural integrity
The results showed that when the fatigue crack growth rate da/dN ≤ 1 × 10−5 mm/cycle, with the stress ratio R ≤ 0.5, the fatigue crack growth threshold ΔKth decreased as the stress ratio R
Summary
[9,10,11,12,13,14,15] The main application fields of FSW such as aerospace and transportation have very high safety requirements, and fatigue resistance of a welded joint is of great significance in ensuring overall structural integrity. The International Institute of Welding (IIW) guideline [16], Eurocode 9 standards [17], and GB/T15248-94 [18] have provided procedures to assess the fatigue. The research on fatigue performance of FSW joints was mainly focused on aspects of fatigue life, fractographic analysis, effects of weld defects, welding parameters, and test conditions. This paper provided a systematic review of the fatigue analysis of friction stir welded joints
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
