摘要
采用组织分析和性能检测的方法,研究了外加纵向直流磁场对镁合金TIG焊电弧形态和焊缝质量的影响。结果表明:磁场可稳定电弧并促使其收缩、旋转,从而使焊接热量集中,熔池搅拌均匀。焊缝由均匀细小且沿一定方向生长的等轴晶组成,其组织为α-Mg和点状β-Mg17Al12相的混合体。焊缝平均显微硬度达到64.1HV0.1,抗拉强度达到210MPa,是母材的84%,比未加磁场时提高了14%。
The Effect of external DC magnetic field on arc shape and weld quality of magnesium alloy TIG welding were analyzed. The results indicate that the arc shape is stabilized, shrinked and rotated by longitudinal DC magnetic field. The welding heat is centralized and the molten bath is stirred evenly. The equiaxed grains in weld zone, which are mixed of α-Mg and punctuated 13-Mg17TAl12. are homogenous and grows along certain direction. In addition, the average microhardness of weld zone is 64.1 HV0.1. The tensile strength of weld zone is 210 MPa, which is 84% of the base plate and 14% higher than that without external magnetic field.
出处
《热加工工艺》
CSCD
北大核心
2009年第11期113-115,共3页
Hot Working Technology
基金
郑州大学研究生科学研究基金项目(A154)
中国博士后科学基金资助项目(20070410875)
关键词
磁场
镁合金
TIG焊
电弧
焊缝质量
magnesium alloy
external magnetic field
TIG welding
arc
welding quality
