电焊机2017，Vol.47Issue(12)：94-98,5.DOI:10.7512/j.issn.1001-2303.2017.12.21
6005A铝合金激光-MIG复合焊接接头超高周疲劳性能试验研究
Experimental study on the ultrahigh cycle fatigue properties of laser-MIG welded joints of 18 mm 6005A aluminum alloy
张伟 1王弘1
作者信息
- 1. 西南交通大学力学与工程学院,应用力学与结构安全四川省重点实验室,四川成都610031
- 折叠
摘要
Abstract
The 6005A aluminum alloy plate with the thickness of 18 mm is welded by the multi-pass multi-layer laser-MIG hybrid welding.Ultrahigh cycle fatigue properties of plate welded joints and base metal are studied with ultrasonic fatigue testing technique.The results show that the fatigue fracture of the welded joints and base metal will still occur when the fatigue life is more than 109 cycles.The high cycle fatigue data points of welded joints are relatively dispersed,both of the S-N fatigue curves of welded joint and base metal display a continuous downward trend.In the range of 106～109 cycles,the fatigue strength of welded joint is only 50％ to 80％ of that of the base metal.Compared with the ⅡW standard fatigue curve,the fatigue properties of welded joint are basically consistent with the ⅡW standard at N=104,and the properties are better than the ⅡW standard in the high cycle range.Microscopic analysis of scanning electron microscopy indicates that cracks in welded joints usually occur on the surface porosities,and the fracture form of fatigue crack is transgranular and mainly shows quasi-cleavage characteristics.关键词
焊接接头超高周疲劳性能/6005A铝合金/激光-MIG复合焊/ⅡW标准Key words
ultrahigh cycle fatigue property of welded joints/6005A aluminum alloy/laser-MIG hybrid welding/ⅡW standard分类
交通工程引用本文复制引用
张伟,王弘..6005A铝合金激光-MIG复合焊接接头超高周疲劳性能试验研究[J].电焊机,2017,47(12):94-98,5.
