The droplet transfer, plasma morphology and droplet morphology of laser arc hybrid welding process are collected and analyzed using high speed camera. The force magnitude and acceleration of motion droplets in the arc space are calculated by the image processing and mathematical calculations. The value and distribution of the recoil force from the metal vapor on droplets are calculated. The results show that the mode of globular transfer corresponds to the welding current is approximately 180A; the mode of streaming transfer corresponds to the welding current is approximately 200 A. The laser has a compress effect on the arc, and the compression on the surface of the weld pool is stronger. The acceleration of the droplet detachment from wire for arc welding and laser arc hybrid welding is 70 m/s2 and 50 m/s2 separately. In the actual welding process, the reaction force of metal vapor on molten droplets is very small, when the distance between droplet and keyhole in the surface of the weld pool is 3 mm. The laser changes the shape arc, and the pressure difference between upper and lower surface of the droplet is changed, which results when the droplet is close to the surface of the weld pool, the droplet coalescence and the transition frequency are slowed down.
XU Chunying
,
LIU Shuangyu
,
ZHANG Hong
,
LI Yanqing
,
LIU Fengde
. Study on the Characteristics and Mechanics of Droplet Transfer in Laser Arc Hybrid Welding Process[J]. Journal of Mechanical Engineering, 2018
, 54(6)
: 154
-161
.
DOI: 10.3901/JME.2018.06.154
[1] LIU S Y,LI Y Q,LIU F D. Effects of relative positioning of energy sources on weld integrity for hybrid laser arc welding[J]. Optics and Lasers in Engineering,2016,81:87-96.
[2] 胡连海,黄坚,庄凯,等. 激光与电弧间距对激光复合焊熔滴过渡的影响[J]. 焊接学报,2010,31(2):49-53. HU Lianhai,HUANG Jian,ZHUANG Kai,et al. Influence of distance between laser and MIG arc on drop transfer process of CO2 laser-MIG hybrid welding[J]. Transactions of the china welding institution,2010,31(2):49-53.
[3] GAO Z M,SHAO X Y,JIAG P,et al. Parameters optimization of hybrid fiber laser-arc butt welding on 316L stainless steel using Kriging model and GA[J]. Optics and Laser Technology,2016,83:153-162.
[4] 刘凤德,张宏,王宇琪,等. 面能量对激光-电弧复合焊接焊缝及熔滴过渡的影响[J]. 机械工程学报,2012,48(14):84-90. LIU Fengde,ZHANG Hong,WANG Yuqi,et al. Influence of area energy for welding seam and droplet transfer on hybrid laser-arc welding[J]. Journal of Mechanical Engineering,2012,48(14):84-90.
[5] ZHANG L J,BAI Q L,NING J. A comparative study on the microstructure and properties of copper joint between MIG welding and laser-MIG hybrid welding[J]. Materials & Design,2016,110(15):35-50.
[6] 孙硕,刘双宇,贾冬生,等. 高氮钢激光-电弧复合焊焊缝成形多元非线性回归模型[J]. 机械工程学报,2015,51(8):67-75. SUN Shuo,LIU Shuangyu,JIA Dongsheng,et al. Multiple nonlinear regression model of weld bead shape for high nitrogen steel by laser-arc hybrid welding[J]. Journal of Mechanical Engineering,2015,51(8):67-75.
[7] LIU S Y,CHEN S X,WANG Q H,et al. Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding[J]. Optics and Lasers in Engineering,2017,92:39-47.
[8] LIU L M,CHEN M H. Interactions between laser and arc plasma during laser-arc hybrid welding of magnesium alloy[J]. Optics and Lasers in Engineering,2011,49(9):1224-1231.
[9] 张旺,李芳,李敏,等. 基于光谱分析的CO2激光+脉冲GMAW复合焊峰值状态激光能量传输研究[J]. 光谱学与光谱分析,2016,36(4):913-918. ZHANG Wang,LI Fang,LI Min,et al. Study of the laser absorption characteristics of CO2 laser-pulsed GMAW hybrid welding based on spectral diagnosis technique[J]. Spectroscopy and Spectral Analysis,2016,36(4):913-918.
[10] 李志勇,王威,王旭友,等. 基于光谱的激光-MAG复合焊耦合机理分析[J]. 机械工程学报,2010,46(8):62-67. LI Zhiyong,WANG Wei,WANG Xuyou,et al. Analysis of laser-MAG hybrid welding coupling mechanism based on spectrum[J]. Journal of Mechanical Engineering,2010,46(8):62-67.
[11] SIBILLANO T,ANCONA A,RIZZI D,et al. Study on the correlation between plasma electron temperature and penetration depth in laser welding processes[J]. Physics Procedia,2010,5(Part B):429-436.
[12] SIBILLANO T,RIZZI D,ANCONA A,et al. Spectroscopic monitoring of penetration depth in CO2 Nd:YAG and fiber laser welding processes[J]. Journal of Materials Processing Technology,2012,212(4):910-916.
[13] LIU S Y,LIU F D,ZHANG H,et al. Analysis of droplet transfer mode and forming process of weld bead in CO2 laser-MAG hybrid welding process[J]. Optics and Laser Technology,2012,44(4):1019-1025.
[14] LIU S Y,LIU F D,XU C Y,et al. Experimental investigation on arc characteristic and droplet transfer in CO2 laser-metal arc gas (MAG) hybrid welding[J]. International Journal of Heat and Mass Transfer,2013,62(1):604-611
[15] 刘双宇,张宏,石岩,等. CO2激光-MAG电弧复合焊接工艺参数对熔滴过渡特征和焊缝形貌的影响[J]. 中国激光,2010,37(12):3172-3180. LIU Shuangyu,ZHANG Hong,SHI Yan,et al. Effects of process parameters on droplet transfer and bead shape in CO2-MAG hybrid welding[J]. Chinese Journal of Lasers,2010,37(12):3172-3180.
[16] 张旺. CO2激光+脉冲GMAW复合焊接等离子体行为及熔滴过渡控制研究[D]. 上海:上海交通大学,2014. ZHANG Wang. An investigation of dynamical metal transfer and plasma interaction during laser-GMAW-p hybrid welding[D]. Shanghai:Shanghai Jiao Tong University,2014.
[17] 孙承伟. 激光辐照效应[M]. 北京:国防工业出版社,2002. SUN Chengwei. Laser irradiating effects[M]. Beijing:National Defence Industry Press,2002.
[18] SEMARK V,MATSUNAWA A. The role of recoil pressure in energy balance during laser materials processing[J]. Journal of Physics D:Applied Physics,1997,30:2541-2552
[19] 胥国祥,张卫卫,刘朋,等. 激光+GMAW复合热源焊熔池流体流动的数值分析[J]. 金属学报,2015,51(6):713-723. XU Guoxiang,ZHANG Weiwei,LIU Peng, et al. Numerical analysis of fluid flow in laser+GMAW hybrid welding[J]. Acta Metallurgica Sinica,2015,51(6):713-723.
