摘要
对5 mm厚的AZ31镁合金板进行GTAW焊过程中,施加纵向交流磁场,在施焊过程中调节磁场参数对试样进行疲劳试验.采用扫描电子显微镜及光学金相显微镜对疲劳试样的断口和显微组织进行分析,研究磁场电流对AZ31镁合金接头组织和力学性能的影响规律,并对磁场作用机理进行探究.结果表明,外加纵向磁场可以促使电弧旋转对熔池进行搅拌,改变晶粒结晶过程,使焊缝中晶粒组织得到细化,进而使焊接接头的疲劳性能得到改善.当磁场电流Im=2 A时,焊接接头疲劳性能达到最佳值.
During the welding of AZ31 magnesium alloy plate(5 mm) by GTAW,AC longitudinal magnetic field was used.The fatigue properties of samples were researched under different magnetic field parameters.Scanning electronic microscope and metallographic microscope were used to analyze the fracture and microstructure of the fatigue samples.The effects of magnetic current on the fatigue properties and microstructure of the welded joint were studied,and the function mechanism of magnetic field was explored.The results show that the AC longitudinal magnetic field stirs welding pool through the rotating arc,changes the crystallizing process of crystal grain to refine the crystal grain and make the fatigue properties of welded joint improve.Under the suitable magnetic field parameter,the electromagnetic stirring achieves the best effect.The optimal value of fatigue property appears when magnetic field current Im=2 A.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第4期79-82,117,共4页
Transactions of The China Welding Institution
基金
辽宁省自然科学基金资助项目(20072041)
辽宁省教育厅基础研究计划资助项目(05L98)
关键词
镁合金
纵向磁场
电磁搅拌
疲劳性能
magnesium alloy
longitudinal magnetic field
electromagnetic stirring
fatigue property
