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

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 coefficient ƞ on droplet transition process and single-pass form under CMT + PA mode, providing reference and guidance for subsequent process optimization.