摘要
采用钨极氩弧(TIG)焊与活性钨极氩弧(A-TIG)焊对异种镁合金AZ61/ZK60进行焊接。结果发现,焊接接头主要由细小的等轴树枝晶与Mg17Al12、MgZn2颗粒组成。当焊接电流为80 A时,接头晶粒细化程度最大,晶粒尺寸为19μm,抗拉强度达到207 MPa。使用A-TIG焊获得的异种镁合金接头抗拉强度和焊缝宽度与焊接前TiO2活性剂涂敷量有关,焊缝两侧不同母材导致的热影响区组织差异并不影响焊缝成型。
The dissimilar joints of AZ61 and ZK60 magnesium alloys were obtained by tungsten inert gas arc(TIG)welding and activating tungsten inert gas arc(A-TIG)welding processes.Microstructure characterization shows that,the fineα-Mg equiaxed dendrite crystals contained Mg17Al12 and MgZn2 particles in the fusion zone.The average size of theα-Mg grains in the fusion zone was refined to 19μm at welding current of 80 A,which resulted in the largest tensile strength of 207 MPa.The tensile strength and the width of the beam of the A-TIG welded AZ61/ZK60 joints showed strong dependence on the amount of TiO2.However,the inhomogeneity of the heat-affected zone near different base metals presented no significant effect on the mechanical properties of the welded joint.
作者
覃波
尹付成
曾承宗
谢佳成
沈骏
Bo QIN;Fu-cheng YIN;Cheng-zong ZENG;Jia-cheng XIE;Jun SHEN(School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,China;Hunan Provincial Key Laboratory of Vehicle Power and Transmission System,Hunan Institute of Engineering,Xiangtan 411104,China;National Engineering Research Center for Magnesium Alloys,College of Material Science and Engineering,Chongqing University,Chongqing 400044,China)
基金
Project(51771160)supported by the National Natural Science Foundation of China
Project(2018JJ4048)supported by the Provincial and Municipal Joint Fund for Natural Science of Hunan Province,China
