1 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106 2 Kunshan Huaheng Welding Co., Ltd., Kunshan 215347
Abstract: In order to extracted weld pool profile accurately, the image processing technology was used to process the short-circuit transition welding high-speed photography image. Based on this extraction method, This article analyzed the relationship between wire feeding speed, short circuit frequency, weld pool vibration frequency and short circuit transition stability. The result indicated that the short circuit frequency was influe-nced by the oscillation of the molten pool below the welding wire. The oscillation was caused by the traveling wave on the surface of the molten pool. Process stability of S-GMAW could be reflected by the short circuit frequency and its dispersion. When the short circuit frequency was high and the dispersion was the smallest, the welding process was stable; the oscillation of welding pool during S-GMAW was periodic, the oscillating frequency of the molten pool decreased continuously with the increase of the wire feeding speed. When the short-circuit frequency was closest to the oscillating frequency of the molten pool, the dispersion of short-circuit frequency was the lowest, the welding process was stable and the weld bead was beautifully formed.
[1] Yudodibroto B Y B. Liquid metal oscillation and arc behaviour during welding. Ph.D. Thesis, Delft University of Technology, NED, 2010. [2] Zhao Ming. Improvement on the numerical simulation precision of completely penetrated gtaw molten pool behaviours. Ph D. Thesis, Shandong University, China 2006(in Chinese). 赵明. 全熔透GTAW熔池形态数值模拟精度的改进.博士学位论文, 山东大学, 2006. [3] Zhao L Q, Wang J F, Lin T, et al. Journal of Shanghai Jiaotong University, 2010, 44(10), 2467 (in Chinese). 赵亮强, 王继峰, 林涛, 等. 上海交通大学学报, 2010, 44(10), 2467. [4] Shi Y, Zhang G, Ma X J, et al. Welding Journal, 2015, 94(5),176. [5] Lv X Q, Zhang P, Li H, et al. Transactions of the China Welding Institution 2017, 38(9),1(in Chinese). 吕小青, 张鹏, 李桓,等. 焊接学报, 2017, 38(9),1. [6] Huang J K, Yang M H, Chen J S, et al. Journal of Materials Processing Technology, 2018, 256,57. [7] Rao Zhenhua. Modeling of heat and mass transfer during gas metal arc welding. Ph D. Thesis, Central South University, China, 2010(in Chinese). 饶政华. 熔化极气体保护焊传热与传质过程的数值研究. 博士学位论文, 中南大学, 2010. [8] Wang Y, Lv X Q, Jing H Y. Transactions of the China Welding Institution,2016, 37(5),49(in Chinese). 王莹, 吕小青, 荆洪阳. 焊接学报, 2016, 37(5),49. [9] Xia S Q, Sun X M. Transactions of the China Welding Institution,2016, 37(1),115(in Chinese). 夏胜全, 孙晓明. 焊接学报, 2016, 37(1),115.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2019, Vol. 33 
