高强铝合金CMT+P电弧增材制造熔滴过渡行为

doi:10.7527/S1000-6893.2022.27881

Abstract

Abstract:

The new technology of Cold Metal Transfer and Pulse （CMT+P） composite arc realizes the fine control of arc energy， and provides a reliable guarantee for obtaining high-quality arc additive formed parts. However， the droplet transfer behavior in the synergistic action of CMT and pulse is not clear， which impacts heavily on the stability of additive process and forming quality. Based on the theory of hydrodynamics and electromagnetism， this paper takes high-strength aluminum alloy as the research object， adopts dynamic grid technology and interface tracking technology， and comprehensively uses numerical simulation and in-situ observation test methods to clarify the evolution mechanism of droplet transfer behavior in the process of CMT+P arc additive of high-strength aluminum alloy. The results show that the simulation results are highly consistent with the experimental results. When the average wire feeding speed is 5 m/s， the droplet transfer of high-strength aluminum alloy CMT+P arc additive process presents a mixed transition mode of short-circuit transition in CMT stage and one pulse one drop ejection transition in pulse stage. The metal liquid bridge formed by the mechanical tension of the fuse in the short circuit stage can effectively avoid the splashing of molten droplets and improve the forming quality. In the pulse stage， the droplet is coupled by electromagnetic force， surface tension， Marangoni force， gravity and plasma flow force to form a static area. The velocity converges or diverges in the static area， forming the characteristics of upward and downward reverse flow velocity， which further affects the stability of droplet transition.

Key words: cold metal transfer plus pulse, arc additive manufacturing, droplet transfer, flow field, high strength aluminum alloy

CLC Number:

V252.2

Zhiqiang ZHANG, Qingze GOU, Xuecheng LU, Hao WANG, Yiran CAO, Zhiyong GUO. Droplet transfer behavior of high strength aluminum alloy CMT+P arc additive manufacturing[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(13): 427881-427881.

Figures/Tables 11

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参数	2A12	氩气
密度/（kg·m^-3）	2780	温度相关
固相线/K	815	84
液相线/K	910	84
比热容/（J·kg^-1·K^-1）	温度相关	521
固相热导率/（W·m^-1·K^-1）	温度相关	温度相关
黏性系数/（kg·m^-1·s^-1）	温度相关	温度相关
电导率/（S·m^-1）	温度相关
930 K时表面张力系数/（N·m^-1）	0.914
表面张力系数温度梯度/（10^-4 N·m^-1·K^-1）	3.5

参数	数值
电流/A	80
电压/V	16
送丝速度/（m·min^-1）	5
扫描速度/（mm·s^-1）	8
氩气流量/（L·min^-1）	20
熔丝半径/mm	0.6

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Droplet transfer behavior of high strength aluminum alloy CMT+P arc additive manufacturing

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