Mechanical behaviour of AA 7475 friction stir welds with the kissing bond defect

作者：Kadlec Martin^*; Ruzek Roman; Novakova Lucie

来源：International Journal of Fatigue, 2015, 74: 7-19.

DOI：10.1016/j.ijfatigue.2014.12.011

• Fatigue strength
• Friction stir welding
• Kissing bond
• 7475 Aluminium alloy
• Aerospace vehicles

Friction stir welding (FSW) is restricted to non-safety-critical aerospace components because there is no reliable method for detecting kissing bonds (KB), which may have a significant effect on fatigue life. The effects of KB defects on the tensile and fatigue properties of 7475-T7351 friction stir welds were quantitatively evaluated with respect to a reference weld without any flaws and a base material. Various KB defects were investigated with the aim of determining the defect size that does not have a significant influence on the fatigue life of joined 6.35-mm-thick plates. A critical value for the KB geometry appears to be a depth of 0.3 mm considering the influence on fatigue life for the investigated configurations. This paper also presents results from micromorphological analyses of the fatigue crack initiation from the KB and from the analysis of the weld cross-section microstructure.

• 出版日期2015-5
• 单位test