YAG脉冲激光焊接AZ61镁合金薄板对接接头的组织与性能  

Microstructure and mechanical properties of YAG pulse laser butt joint of thin AZ61 magnesium alloy sheets

作　　者：李志军[1] 王红英[1] 

机构地区：[1]深圳职业技术学院工业中心,深圳518055

出　　处：《焊接学报》2012年第8期69-72,116,共4页Transactions of The China Welding Institution

摘　　要：采用YAG脉冲激光焊方法对AZ61镁合金薄板进行焊接.利用光学显微镜、X射线能谱分析仪等手段分析焊接接头的宏观形貌、显微组织和化学成分,并对焊接接头的显微硬度和拉伸强度进行了测试.结果表明,焊缝正面有轻微塌陷,反面成形良好.焊缝表面圆滑、连续、鱼鳞纹细密均匀,接头成形良好.母材为粗大的等轴晶,焊缝区的晶粒比母材细小.焊缝区的显微硬度比母材区域明显提高,焊接接头的抗拉强度与母材相当,约为250 MPa,焊接接头具有良好的力学性能;焊缝表面由于Mg元素的大量蒸发使铝的含量升高,而焊缝表面Zn元素含量很低.YAG pulse laser welding of thin AZ61 magnesium alloy sheets was conducted.The microstructure and chemical compositions of the welded joint were examined with optical microscope(OM) and energy dispersive X-ray analysis(EDX),and the microhardness and tensile strength of the joints were measured.The results show that the weld front side slightly collapsed but the weld back side shaped well.The weld had good appearance and solid mechanical properties.The grain was finer and the microhardness was higher in the fusion zone than that in the base metal.The tensile strength of the joint was 250 MPa,equivalent to that of the base metal.The evaporation of Mg led to the increasing of Al content in the weld,but the Zn content was low.

关 键 词：AZ61镁合金 激光焊 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]