ZM6镁合金铸件TIG焊补焊工艺  

Research on TIG repairing technology for ZM6 magnesium alloy casting

作　　者：王欣[1] 杨闯[2] 冯吉才[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]黑龙江工程学院材料与化学工程系,哈尔滨150050

出　　处：《焊接学报》2010年第9期33-36,共4页Transactions of The China Welding Institution

基　　金：国家863高技术研究发展计划资助项目(2002AA331160)

摘　　要：根据拉伸性能测试结果及X-射线探伤检测确定了ZM6镁合金铸件TIG焊补焊工艺参数.并通过光学显微镜对焊接接头进行了微观组织观察和微区成分分析试验.结果表明,热影响区晶粒大小与母材基本相同.在热影响区晶内完全由Mg元素组成,晶内原有的合金元素迁移到晶界.焊缝组织由比母材晶粒尺寸小的细小等轴晶组成,焊缝区的晶内组织基本由Mg元素组成,其晶界合金元素含量要比母材与热影响区少.通过对ZM6镁合金铸件补焊中的裂纹位置以及成分分析,得出ZM6镁合金铸件补焊裂纹为结晶裂纹.The processing parameters of TIG repairing welding for ZM6 magnesium alloy casting were determined by testing tensile properties and X-ray.The same grain size between heat-affected zone and the base material was found by observing the microstructure of welded joints in the optical microscope and analysing micro-area composition.The element in the heat affected zone was basically occupied Mg,and the original crystal alloy elements within intragranular were migrated to the grain boundary.Weld was composed of small equiaxed crystal,the size of which was smaller than that in the base material.The grain in weld zone was also entirely occupied by Mg elements.The contents of alloying elements in the grain boundary were less than those in the base material and heat-affected zone.The crystal cracks for welding in ZM6 magnesium alloy casting were found by observing the crack location and investigating the process of welding of ZM6 magnesium alloy casting.

关 键 词：ZM6镁合金铸件 TIG焊补焊 工艺方法 

分 类 号：TG115.28[金属学及工艺—物理冶金]