Developing more efficient welding methods and processes is a hot topic in the international welding industry, and increasing welding current and extension length is a direct approach to improve melting efficiency of MAG welding. Through improving commercial MAG welding machine, wire feeding speed can reaches 50 m/min, and the welding current is up to 500 A or more so as to further enhance welding efficiency. But the formation of rotating spray transfer of droplet, resulting in welding arc instability and lots of spatters, thus an alternating magnetic field is applied to control the arc morphology and droplet transfer behavior. With the welding experiment, the influence of welding current on spatter rate and metal evaporation rate was analyzed and the droplet transfer behavior and weld appearance under alternating magnetic field was studied. The results show that under high welding current with low frequency magnetic field can effectively enhance the arc stiffness and stability, shorten the length of liquid stream and reduce the deflection of fluid tip, improve the weld appearance, and then greatly increase the welding efficiency.
FAN Ding
,
ZHENG Falei
,
XIAO Lei
,
CHEN Kexuan
. Droplet transfer behavior and alternating magnetic field controlled experimental study of high efficiency MAG welding[J]. Transactions of The China Welding Institution, 2019
, 40(5)
: 1
-5
.
DOI: 10.12073/j.hjxb.2019400118
[1] Lahnsteiner R. The T.I.M.E. process-an innovative MAG welding process[J]. Welding Review International, 1992, 2:17-20.
[2] Moinuddin S Q, Kapil A, Kohama K, et al. On process-property interconnection in anti-phase synchronized twin-wire GMAW of low carbon steel[J]. Science and Technology of Welding and Joining, 2016, 21(6):452-459.
[3] Zhan X H, Gao Q Y, Gu C, et al. The porosity formation in the laser-MIG hybrid welded joint of invar alloy[J]. Optics and Laser Technology, 2017, 95(10):86-93.
[4] 林三宝,范成磊,杨春丽.高效焊接方法[M].北京:机械工业出版社, 2011.
[5] Suban M, Tusek J. Dependence of melting rate in MIG/MAG welding on the type of shielding gas used[J]. Journal of Materials Processing Technology, 2001, 119:185-192.
[6] 包晔峰,周昀,吴毅雄,等.大电流MAG焊旋转喷射过渡中的熔滴失稳分析[J].焊接学报, 2003, 24(6):73-76 Bao Yefeng, Zhou Yun, Wu Yixiong, et al. Instant unstable phenomenon of rotational spray transfer in high-current MAG welding[J]. Transactions of the China Welding Institution, 2003, 24(6):73-76
[7] Kap P, Suoranta R, Martikainen J. Advanced gas metal arc welding processes[J]. The International Journal of Advanced Manufacturing Technology, 2013, 67(1-4):655-674.
[8] Chang Yunlong, Liu Xiaolong, Lu Lin. Impacts of external longitudinal magnetic field on arc plasma and droplet during short-circuit GMAW[J]. International Journal of Advanced Manufacturing Technology, 2014, 70(9-12):1543-1553.
[9] 陈树君,王军,王会霞,等.纵向磁场作用下的旋转射流过渡的机理[J].焊接学报, 2005, 26(3):45-49 Chen Shujun, Wang Jun, Wang Huixia, et al. Principle of rotating transfer undergoing longitudinal magnetic field control[J]. Transactions of the China Welding Institution, 2005, 26(3):45-49
[10] 常云龙,李海涛,梅强,等.外加纵向磁场对CO2焊接短路液桥的影响[J].沈阳工业大学学报, 2015, 37(6):624-628 Chang Yunlong, Li Haitao, Mei Qiang, et al. Influence of external longitudinal magnetic field on short circuit liquid bridge of CO2 welding[J]. Journal of Shenyang University of Technology, 2015, 37(6):624-628
