摘要
以氦-氩混合气体为保护气氛,外加纵向交直流磁场,采用正交试验方法,对AZ31+1%Ce+1%Sb镁合金板材进行了气体保护钨极电弧焊工艺参数的优化。结果表明:焊接电流对焊接质量影响最大,焊接速度次之,外加交流磁场电压影响最小。获得良好焊逢的最佳参数为:焊接电流75A,焊接速度15cm/min,外加交流磁场电压18V,喷嘴直径7mm,钨极直径2.5mm,电弧长度2.5～4mm,保护气配比为50%He+50%Ar,流量150mL/s。可得到外观成形性良好、平均显微硬度69HV0.1、抗拉强度220N/mm2的焊接接头,满足工业生产的需要。
On the conditions of helium-argon mixture gas used as protective atmosphere and applying longitudinal AC/DC magnetic field, the GTAW parameters of AZ31＋Ce＋Sb plate were optimized by orthogonal test. The results indicate that welding current is the greatest influence factor on welding quality followed by welding speed and voltage of external AC magnetic field. The optimum process parameters are welding current 75 A, welding speed 15 cm/min, voltage of external AC magnetic field 18 V, nozzle diameter 7 mm, tungsten diameter 2.5 mm, arc length 2.5～4 mm, gas composition 50%He＋50%Ar, gas-flow rate of helium-argon 150 mL/s. The welded joint with good formability, average microhardness 69 HV0.1 and tensile strength 220 N/mm^2 is obtained under the above condition, which can meet the needs of industrial production.
出处
《热加工工艺》
CSCD
北大核心
2010年第13期117-119,共3页
Hot Working Technology
基金
中国博士后科学基金资助项目(20070410875)
