电焊机2018，Vol.48Issue(3)：246-249,4.DOI:10.7512/j.issn.1001-2303.2018.03.48
AZ31B镁合金TIG焊接接头组织与性能
Microstructures and properties of AZ31B magnesium alloy TIG welding joints
吴晓明 1陈丽园 1景锋 1马永志 1郭瑞青1
作者信息
- 1. 中车唐山机车车辆有限公司,河北唐山063035
- 折叠
摘要
Abstract
Microstructures and properties of 4 mm AZ31B magnesium alloy welded joints welding by TIG were studied respe-ctively through tensile tests,bending tests,hardness tests and analysis in this paper.The tensile test results showed that,all the specimens were broken in the heat affected zone and the tensile strength satisfied the standard.The grain size of the TIG weld zone is relatively small,the organization is α-Mg solid solution,the grain boundary is dispersed with the black β-Mg17Al12 precipitation phase,and the grain size of the heat affected zone is longer than that of the base metal.The hardness of the base metal is higher than that of the heat area and weld,there is a softening phenomenon in the joint heat affected zone.It also can be seen that the cracked position of the pulsating tensile fatigue fracture specimen of the 4 mm AZ31B magnesium alloy TIG welding joint (removed excess weld metal) is in the heat affected zone.关键词
AZ31B镁合金/TIG焊/组织与性能/疲劳Key words
AZ31B magnesium alloy/TFIG welding/microstructure and mechanical performance/fatigue分类
矿业与冶金引用本文复制引用
吴晓明,陈丽园,景锋,马永志,郭瑞青..AZ31B镁合金TIG焊接接头组织与性能[J].电焊机,2018,48(3):246-249,4.
