Analysis of Friction Stir Lap Welding for the Fuselage Skin Structure
- 作者：MENG QiangGUO XiaojuanFENG Xiaomei
- 会议时间：2012-10-18
- 关键词：Friction stir welding ; gray line ; mechanical properties ; EBSD ; EPMA
- 作者单位：MENG Qiang(ChinaFSWCenter(Beijing FSW Technology Co.,Ltd)Beijing China 100024)GUO Xiaojuan(ChinaFSWCenter(Beijing FSW Technology Co.,Ltd)Beijing China)FENG Xiaomei(No.14 Institute of China Electronics Technology Group Corporation Nanjing China)
- 母体文献：第二届搅拌摩擦焊国际会议论文集
- 会议名称：第二届搅拌摩擦焊国际会议
- 会议地点：北京
- 主办单位：中国搅拌摩擦焊中心
- 语种：chi
摘要
Friction Stir Welding (FSW) Technology has many benefits for aluminumalloy joining in the aspects of the improved tensile strengths and fatigue properties compared with conventional riveted joints.Now the Friction Stir Welding Technology has been used for joining stiffeners to skins of the craft.The material is anodized 2024-T62 aluminum alloy.The strength and fatigue properties ofjointsmeet the requirements of the design.However,we found the " gray line" on the X-ray film,which is different from the defect of cavity,which is darker than that of the defect of cavity and without significant boundaries.The position of the "gray line" located on the edge of the pin.The microstructures of cross section with the gray line were observed,but no conventional defect is found,even though,the gray line had little influence on the fatigue and static mechanical testing results,and the position of crack kept away from the "gray line".Through tropism histological analysis,micrnstructure observation,we found that small angle between grain boundaries and incident direction facilitated X-ray to pass through and resulted in the gray line on X-ray film.