Effect of depositio n current on forming characteristics of CMT wire arc additive manufactured magnesium alloy

熔积电流对镁合金CMT熔丝增材成形特征的影响 Effect of depositio n current on forming characteristics of CMT wire arc additive manufactured magnesium alloy 倪加明 NI Jiaming 1 first-author 刘思余 LIU Siyu 1 陈梦凡 Chen Mengfan 1 王锋华 WANG Fenghua 2 李宝辉 LI Baohui 1 上海航天精密机械研究所 上海航天精密机械研究所 Shanghai Aerospace Precision Machinery Institute Shanghai Aerospace Precision Machinery Institute 上海交通大学材料学院国家轻合金工程中心 上海交通大学材料学院国家轻合金工程中心 National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,School of Materials Science and Engineering,Shanghai Jiao Tong University National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,School of Materials Science and Engineering,Shanghai Jiao Tong University 针对AZ80镁合金CMT熔丝增材制造工艺,开展不同熔积电流对镁合金直壁试样成形特性的影响规律研究。结果表明,CMT熔丝增材熔积速度为10 mm/s时,熔积电流在85～125 A范围内可获得成形良好的单道镁合金直壁试样,稳定成形直壁高度比起弧、熄弧位置略高,高度偏差控制在2.6 mm以内;随着熔积电流从85 A增至125 A,熔积层层间层高从2.39 mm减小到2.16 mm,而熔积层层宽则从8.61 mm增至14.23 mm;熔积电流过大或过小均会影响直壁试样的表面粗糙度,熔积电流为105 A时表面粗糙度最小,粗糙度为0.16 mm。 For the CMT wire arc additive manufacturing of AZ80 magnesium alloy,the influence of different deposition currents on the forming characteristics of magnesium alloy samples was studied. The results show that the single-pass magnesium alloy samples with good shaping can be obtained by CMT wire arc additive manufacturing with a deposition speed of 10 mm/s and the deposition current of 85～125 A. The height of the middle stable region is slightly higher than that of the arc starting and arc ending points. And the height deviation is controlled within 2.6 mm. With the deposition current increasing from 85 A to 125 A,the height of the deposited layer decreases from 2.39 mm to 2.16 mm,while the width of the deposited layer increases from 8.61 mm to 14.23 mm. Too large or too small deposition current will affect the surface roughness of the samples. The minimum surface roughness is 0.16 mm when the deposition current is 105 A. 镁合金 CMT熔丝增材 熔积电流 成形特征 magnesium alloy CMT wire arc additive manufacturing deposition current forming characteristics TG146.22 国家自然科学基金（51601112） 2022-03-08 8 51