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Root Welding of V-Groove Thick Plate without Backing Plate by MAG-TIG Double-Arc Welding
Yan-Bin Zhou,Disheng Fang,Li-Ming Liu 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.4
MAG-TIG (metal active gas-Tungsten inert gas) double-arc welding process is applied to make stable back beads in the first layer during one-side multilayer welding without backing plate. To explain the reason why stable back beads can be formed, a comparison was made between single MAG welding and MAG-TIG double-arc welding. Results indicated that during the optimized condition in MAG-TIG double-arc welding, about one-third heat energy of the heat source acts on the root face, and about two-third heat energy acts on the molten pool. The distribution of temperature and surface tension in the molten pool must be more balanced and reasonable, in order to obtain the ideal back weld bead formation. This process is a new welding process giving high quality and efficiency in root welding of thick plate.
Liming Liu,Fei Liu,Disheng Fang,Hongyang Wang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Based on the idea of alloying welding seam, a series of Zn-30Al-xTi filler metal was used to join Mg/Al dissimilar metals by tungsten inert gas welding, where the x was 0, 0.05, 0.1, 0.5, and 1, respectively. The effect of various Ti content on the microstructure and the mechanical property of Mg-Al butt joints was investigated. Results indicated that the fusion zones of the joints were mainly composed of α-Al, MgZn2 and Al-Zn eutectics when the Ti content was 0.05, 0.1 and 0.5 wt.%, and Al3Ti compounds could precipitate first and act as nucleuses during solidification process when the Ti content was appropriate. The mechanical property of the weld joints improved consistently to the increasing content of Ti. The optimum average tensile strength of the joints reached 148 MPa when Zn-30Al-0.5Ti was used, but the average tensile strength decreased again when Zn-30Al-1Ti was used.