Xian Aircraft Industry Group Company Ltd under AVIC

Fengcheng, China

Xian Aircraft Industry Group Company Ltd under AVIC

Fengcheng, China
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Wang J.,Harbin Institute of Technology | Sun Q.,Harbin Institute of Technology | Zhang S.,Harbin Institute of Technology | Wang C.,Harbin Institute of Technology | And 3 more authors.
Journal of Materials Processing Technology | Year: 2018

To evaluate the effectiveness of arc bubble, the influences of controllable arc bubble on the process stability and microstructural evolution of welded joint under different welding conditions were investigated. The main welding conditions, including onshore welding, conventional underwater wet welding (UWW) and mechanical constraint assisted UWW (MC-UWW), were characterized and compared. The exerted mechanical constraint resists the arc bubble detachment and keeps the larger arc bubble attached to the weld pool surface for providing better protective effect of welding region. The adverse effect of surrounding water with its higher heat conduction is not negligible compared with onshore welding, and the mechanical coupling between arc bubble and constraint device plays a vital role in affecting the arc stability and joint quality. Microstructure analyses revealed that under the same welding parameters, the proportion of brittle microstructure in weld metal follows the order: UWW > MC-UWW > onshore welding. A more stable wet welding process can be realized by controlling the arc bubble detachment, which provides a new orientation for wet welding technique application. © 2017 Elsevier B.V.


Tang J.,Northwestern Polytechnical University | Tian X.,Northwestern Polytechnical University | Geng J.,Northwestern Polytechnical University | Bai M.,Xian Aircraft Industry Group Company Ltd under AVIC | Liu X.,Xian Aircraft Industry Group Company Ltd under AVIC
Advanced Materials Research | Year: 2013

In order to improve showing effect of the aircraft assembly simulation, a new assembly process simulation optimization method was proposed with combining evaluation of viewpoints with view transformation. First, viewpoints evaluation principle was put forward according to assembly simulation features; then a new view coordinate system was calculated based on the view coordinate system transformation matrix by integrating the direction of assembly paths with the viewpoints evaluation principle; finally, entire optimized process of assembly simulation was analyzed. Efficiency of this method was verified by comparing the result of the optimized wing box assembly simulation with the one which had not been optimized. © (2013) Trans Tech Publications, Switzerland.


Geng J.,Northwestern Polytechnical University | Tian X.,Northwestern Polytechnical University | Bai M.,XiAn Aircraft Industry Group Company Ltd under AVIC | Jia X.,Northwestern Polytechnical University | Liu X.,XiAn Aircraft Industry Group Company Ltd under AVIC
Computers in Industry | Year: 2014

Aiming to improve the feasibility of maintenance, repair and overhaul (MRO) planning, the accuracy of MRO description and the clarity of on-site guidance for complex products MRO job card, a design method for complex products three-dimensional (3D) MRO job card based on product 3D model and using the model based definition (MBD) technology was proposed. This method applies position-posture calculation of initial disassembly based on assembly constraints to realize the visual disassembly planning for complex products in 3D environment, uses dynamic viewpoint navigation method to implement the display of disassembly and assembly simulation process of parts conforming to the observation habit of human, adopts multi-view 3D annotation method to implement the separation showing for technical requirements from different MRO disciplines and operation tasks, and finally, transforms the MRO order information into 3D portable job card file based on lightweight model and releases it to MRO worksite. The aircraft right wing maintenance instance shows that this method can implement the intuitive, accurate and non-ambiguous MRO process description, improve the rationality of MRO planning, and increase the efficiency and quality of complex products MRO. © 2013 Elsevier B.V.

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