AZ31+Ce+Sb镁合金气保护钨极电弧焊工艺优化
Optimization of GTAW Process for AZ31+1%Ce+1%Sb Alloy
陈 永， 刘 茜， 张冠宇， 关绍康
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作者单位：郑州大学 材料科学与工程学院，河南 郑州 450002
中文关键字：镁合金； 气保钨极电弧焊； 工艺优化
英文关键字：magnesium alloy; GTAW; technology optimization
中文摘要： 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75 A，焊接速度15 cm/min，外加交流磁场电压18 V，喷嘴直径7 mm，钨极直径2.5 mm，电弧长度2.5～4 mm，保护气配比为50%He＋50%Ar，流量150 mL/s。可得到外观成形性良好、平均显微硬度69 HV0.1、抗拉强度220 N/mm2的焊接接头，满足工业生产的需要。
英文摘要：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/mm2 is obtained under the above condition, which can meet the needs of industrial production.