The team of Jia Chuanbao of the School of Materials Science and Engineering of Shandong University has long been devoted to the research on the detection and control of physical processes of arc machining under extreme conditions, arc additive manufacturing technology and new methods of efficient welding. Recently, the team has invented a new method of arc additive manufacturing for metal materials. It has made important progress in reducing heat input and revealing the principles of complex physical phenomena in the arc additive manufacturing process, and has received international media attention and positive comments.
1. Propose a new method of arc-additive manufacturing for metal materials
The research group creatively invented a "Compulsively Constricted Wire Arc Additive Manufacturing" (CC-WAAM) based on an arc heat source, and proposed to establish a "welding wire-tungsten electrode" indirect arc as a heat source to control the arc Combustion in a confined space and force it to be ejected through a high temperature resistant (CBN) ceramic nozzle, forced to produce a high stiffness arc plasma, and wrap the high temperature liquid metal to fall, forcing the shape of the droplet and excessive trajectory Restraint, heat preservation and regulation effects can effectively reduce the heat input of the arc to the cladding metal, and have important application potential for high-precision and high-quality additive manufacturing of large-sized metal components. The research result was published in the authoritative journal Additive Manufacturing (2019 impact factor IF = 7.173) in the field of additive manufacturing in May 2019 with the title of "Compulsively constricted WAAM with arc plasma and droplets ejected from a narrow space". The publication is affiliated to America Makes, National Additive Manufacturing Innovation Institute (National Additive Manufacturing Innovation Institute), is a JCR TOP journal, ENGINEERING ranking 1/49, Industrialand Manufacturing Engineering ranking 4/324.
link:
https://doi.org/10.1016/j.addma.2019.03.003
2. Based on the visual sensing method, it reveals the important physical mechanism of the arc and droplet generation process of the forced restraint arc additive manufacturing
In view of the closed structure of the welding gun, a water-cooled copper nozzle with high-temperature glass was designed and processed. With the help of a high-speed camera, the arc and droplet transition behavior under different electrical parameters and shielding gas flow parameters were explored, and the electrical parameters and The influence mechanism of shielding gas parameters on arc and droplet transition. The research results were published in the Journal of Materials Processing Technology (Journal of Materials Processing TOP of the Chinese Academy of Sciences SCI) Area JCR, MaterialsScience ranked 7/150, IF = 4.178. After the article was published, it received the attention and positive comment of the famous British additive manufacturing website. It was reported in August 2019 as "Shandong UniversityDevelops new WAAM Technique" University researchers have developed a new metal 3D printing method called "Compulsory Restrained Arc Additive Manufacturing" (CC-WAAM), which has improved arc additive manufacturing technology and has better results in the control of metal forming status A multi-layer cladding metal with uniform microstructure distribution characteristics was obtained.