中国焊接
中國銲接
중국한접
CHINA WELDING
2014年
4期
76-82
,共7页
欧阳瑞洁%从保强%齐铂金%刘方军
歐暘瑞潔%從保彊%齊鉑金%劉方軍
구양서길%종보강%제박금%류방군
ultrahigh frequency pulse current%variable polarity gas tungsten arc welding%aluminum alloy%mechanical property
Optimization ofhybrid ultrahigh frequency pulse variable polarity gas tungsten arc welding (HPVP-GTAW)process was carried out to obtain the optimum weld characteristics of5 A06-HX4 aluminum-magnesium alloy sheets of3 mm thickness. The square butt joints were produced by HPVP-GTAW process,the microstructure and mechanical properties were systematically investigated. It is observed that the process parameters influence the weld microstructure and mechanical properties significantly.Weld microstructure is mainly composed ofgrid α(Al)solid solution,with a large number ofintermetallic β(Mg2Al3)precipitates distributed in the matrix.The amount ofβ(Mg2Al3 )precipitates has an obvious difference with different parameters.Compared with that ofthe base material,tensile strength of5 A06-HX4 alloy welded joints has a certain reduction,as well as the elongation and reduction ofarea.The optimized welding process parameters for 5A06-HX4 alloy sheets are presented.
