| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Droplet Transfer on the Microstructure and Mechanical Properties of Aluminum Alloy Additive Under Different Pulse Modes |
| HUANG Zhongli1, HUANG Jiankang1,2,*, ZHANG Hongfu2, YU Xiaoquan1, LIU Guangyin1, FAN Ding1,2
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1 State Key Laboratory of Advanced Processing and Reuse of Non-ferrous Metals, Lanzhou University of Techonlogy, Lanzhou 730050, China
2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Using single and double pulse MIG arc additive manufacturing process to prepare aluminum alloy forming parts, using high-speed camera and electrical signal synchronization acquisition system to monitor the additive process in real time, combining with real-time voltage and current signals during the stacking process for comparison and analysis. The droplet transfer behavior of single and double pulse MIG process and its influence on the microstructure and mechanical properties of additive parts were discussed. The results show that the droplet transfer of single pulse and double pulse is one droplet transfer with one pulse. Compared with the single pulse large drop mode, the droplet transfer frequency of double pulse MIG process is higher, the droplet size is smaller, and the accuracy of aluminum alloy forming parts is higher. The microstructure obtained by single pulse and double pulse mode is obviously different. In double pulse MIG process, fine grains can be obtained at the fusion of two layers, which effectively improves the microstructure of stacking layer. Comparing the mechanical properties of the two arc waveforms, the maximum tensile strength of the double-pulse MIG additive can reach 245.57 MPa.
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Published: 25 July 2023
Online: 2023-07-24
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| Fund:National Natural Science Foundation of China (52175324), Program for Hongliu Distinguished Young Scholars in Lanzhou University of Technology. |
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2023, Vol. 37 
