Investigation on metal transfer and deposition in micro-plasma arc freeform fabrication controlled by local alternating magnetic field. (July 2022)

• Record Type: Journal Article
• Authors: Qu, Yuanyuan; Hong, Bo; Hong, Yuxiang; Li, Xiangwen; Gao, Jiapeng; Lin, Jian
• Is Part Of: Journal of manufacturing processes. Volume 79(2022)
• Page Start: 678
• Page End: 687
• Publication Date: 2022-07
• Subjects: Wire-arc additive manufacturing -- Metal transfer -- Magnetically controlled micro-plasma arc -- Deposition forming -- Frequency magnetic field; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2022.04.060
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: Wire-arc additive manufacturing (WAAM) technology realizes part manufacturing with high deposition efficiency and material utilization. However, the unstable metal transfer process, high heat input, and unconcentrated arc energy make this technology face the challenges of poor stability, forming accuracy, and application range. In this work, an innovative micro-plasma arc directed energy deposition (mPA-DED), that is, a local alternating magnetic field (LAMF) to dynamically control the metal transfer to mitigate these issues. Experiments show that LAMF can control the heated position of the liquid bridge, reduce excess energy, and maintain the dynamic stability of the bridge transfer. Metal parts with high forming accuracy can be stable fabricated. In addition, when the wire feeding speed changes, the deposition layer with good appearance can be obtained again by adjusting the frequency of the magnetic field, which indicates the good adapt-ability of this technology. Under the action of LAMF, the dynamic change process of the bridge transfer has a certain periodicity, and the mechanism of this regular change is carefully analyzed for the first time. Finally, a well-formed metal wall has been fabricated by using the novel technology of LAMF to control the mPA-DED.