Experimental investigations of tungsten inert gas assisted friction stir welding of pure copper plates

CAR2017 International Congress of Automotive and Transport Engineering - Mobility Engineering and Environment

工业技术;运输工程

Constantin, M.A.^1 ; Boneag, A.^1 ; Nitu, E.^2 ; Iordache, M.^2

University Politehnica of Bucharest, Machine Building Technology Department, Splaiul Independenei Street No. 313, Romania^1

University of Pitesti, Manufacturing and Industrial Management Department, Târgul din Vale Street No.1, Romania^2

关键词: Conventional fusion welding process;    Experimental investigations;    Friction stir welding(FSW);    Frictional heating;    Process parameters;    Solid-state joining;    Supplementary heat;    Tungsten inert gas;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/252/1/012038/pdf
DOI  :  10.1088/1757-899X/252/1/012038

学科分类：工业工程学

来源: IOP

【 摘 要 】

Welding copper and its alloys is usually difficult to join by conventional fusion welding processes because of high thermal diffusivity of the copper, alloying elements, necessity of using a shielding gas and a clean surface. To overcome this inconvenience, Friction Stir Welding (FSW), a solid state joining process that relies on frictional heating and plastic deformation, is used as a feasible welding process. In order to achieve an increased welding speed and a reduction in tool wear, this process is assisted by another one (WIG) which generates and adds heat to the process. The aim of this paper is to identify the influence of the additional heat on the process parameters and on the welding joint properties (distribution of the temperature, hardness and roughness). The research includes two experiments for the FSW process and one experiment for tungsten inert gas assisted FSW process. The outcomes of the investigation are compared and analysed for both welding variants. Adding a supplementary heat source, the plates are preheated and are obtain some advantages such as reduced forces used in process and FSW tool wear, faster and better plasticization of the material, increased welding speed and a proper weld quality.