Abstract
As a high-efficiency and high-quality welding process, hybrid laser-MAG welding (HLMW) has significant potential of application in welding thick plates. In the present study, based on thermal elastic–plastic theory, a three-dimensional finite element model is developed to predict the weld shape characteristics, residual stress and distortion in HLMW for a butt joint of 12-mm-thick high strength steel plate. Metal active gas arc welding (MAG) heat input and laser energy are modeled as one double-ellipsoid body heat source and one cone body heat source with enhanced peak density along the central axis, respectively. The comparison between calculated molten pool shapes and those obtained by the experiment shows a good agreement. Then weld shape characteristic, residual stresses and distortions are calculated in four different welding process parameters. The results show that the increase of laser power and current can effectively increase the weld penetration width when the welding speed is fixed. At the top surfaces of weldment, the peak stress of high laser beam power is more significant than that of low laser beam power. A high compressive transverse stress of low laser beam power can be found at the welding zone and the surrounding heat affected zone. However, at the bottom surfaces of weldment, the peak stress of low laser beam power is larger than that of high laser beam power. The peak stress of low laser beam power is much larger than that of high laser beam power. A high compressive transverse stress of low laser beam power can be found at the welding zone. The vertical deformation in low laser beam power and low arc current welding has the lowest value.
About the authors
Yongxin Lu, born 1986, graduated with a doctor’s degree from the School of Materials Science and Engineering, Tianjin University, China, in 2017. Then, he continued to work in the School of Materials Science and Engineering, Xi’an Shiyou University, China. Currently, he is a lecturer and his main research areas are control and simulation of welding stress and deformation.
Xueli Xu, born 1963, graduated with a master’s degree from Xi’an Jiaotong University. Then, he continued to work in the School of Materials Science and Engineering, Xi’an Shiyou University, China. Currently, he is a professor and his main research areas are material forming and control engineering.
Binhua Zhang, born 1996, graduated with a bachelor’s degree from the School of Materials Science and Engineering, Xi’an Shiyou University, China, in 2018. Currently, she is a graduate student at the School of Materials Science and Engineering, Xi’an Shiyou University, China. Her main research areas are welding residual stress, deformation control and finite element analysis of welded joints.
Wei Qiang, born 1988, graduated with a doctor’s degree from the School of Materials Science and Engineering, Nanjing University of Science and Technology, China, in 2018. Then, he continued to work in the School of Materials Science and Engineering, Xi’an Shiyou University, China. Currently, he is a lecturer and his main research area is multi heat source high efficiency welding.
Hao Lu, born 1981, graduated with a doctor’s degree from Harbin Institute of Technology, China, in 2009. Now, he is a professor at the School of Material Science and Engineering, Xi’an Shiyou University, China. Currently, his main research areas are welding stress and deformation.
Dafeng Wang, born 1987, graduated with a doctor’s degree from the School of Materials Science and Engineering, University of Science and Technology Beijing, China, in 2017. Then, he continued to work in the Institute of Welding and Remanufacturing, Ningbo Branch of Chinese Academy of Ordnance Science, China. Currently, he is an associated professor and his main research areas are advanced welding technology.
Haitao Wang, born 1984, and graduated with a master’s degree from the School of Materials Science and Engineering Lanzhou University of Technology, China, in 2010. Then, he continued to work in Baoji Petroleum Steel Pipe Co., Ltd. as a senior engineer, He is mainly engaged in the development of new oil and gas pipe products.
Zhou Wang, born 1999, graduated with a bachelor’s degree from the School of Materials Science and Engineering, Xi’an Shiyou University, China, in 2020. Then, he worked at the West Pipeline Company, China.
Acknowledgement
The authors wish to acknowledge the financial supported by State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology (Program No.: AWJ-21M21), and Natural Science Basic Research Program of Shaanxi (Program No.: 2020JQ-768).
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