2219铝合金CMT电弧增材熔滴过渡行为

The metal transfer behavior in CMT-based wire arc direct energy deposition of 2219 aluminum alloy

在冷金属过渡(cold metal transfer,CMT)电弧增材制造过程中,熔池的流动行为极易受到电弧和熔滴的影响,从而严重影响堆积层的稳定性和成形件质量.该文利用高速摄影结果及电信号参数波形图,引入热输入量计算公式,从特征电信号、熔滴过渡特征量、热输入量等方面定量分析了CMT+P模式下送丝速度及脉冲修正系数对熔滴过渡过程及单道成形形貌的影响,同时分析了脉冲变极性冷金属过渡(Advanced CMT,CMT+PA)模式下送丝速度及控制面板上的EP/EN修正系数η对熔滴过渡过程及单道成形形貌的影响,为后续工艺优化提供参考和指导.

In the process of cold metal transfer(CMT)arc additive manufacturing,the flow behavior of the molten pool is easily affected by arc and droplet,which seriously affects the stability of the deposited layers and the quality of the formed parts.Using high-speed photography results and waveform graphs of electrical signal parameters and introducing a formula for calculating heat input,this article quantitatively analyses the influence of wire feeding speed and pulse correction coefficient on droplet transition process and single-pass form under CMT+PA mode from the aspects of characteristic electrical signals,droplet transition characteristics,heat input,etc.,and also analyses the influence of wire feeding speed and EP/EN coefficientƞon droplet transition process and singlepass form under CMT+PA mode,providing reference and guidance for subsequent process optimization.