Residual stress and microstructure evolution of high #br#
frequency welding of longitudinal pipe
HAN Yi1,XIAO Yao1,MIN Xiangling2,YU Enlin1,LI Dalong1,GAO Ying3
(1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University,
Qinhuangdao 066004, Hebei, China;2. Research Institute of Bohai Petroleum Equipment Manufacturing Co., Ltd.,
Chinese Petroleum Corporation, Tianjin 300459, China;3. College of Materials Science and Engineering,
Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China)
Abstract:With the rapidly development of crossdisciplines such as steel,metallurgy and electromagnetics in China,the output and quality of welded steel pipes are increasing day by day. The longitudinal pipe induction welding is the key process for producing high frequency welded pipes. Obtaining the more accurate residual stress distribution and microstructure evolution of welded pipes is the key factor to further improve the quality of welded pipes and the concerns of researchers. The effects of heat transfer and microstructure transformation on the stress are considered. For the unique hourglass welding temperature field of the highfrequency longitudinal welded pipe,the evolution process and the residual stress distribution of microstructure in the heat affected zone are quantitatively analyzed. The residual stress distribution is obtained,considering the thermal stress and microstructural stress. The results show that the radial residual stress is smaller near the weld seam,and the axial residual stress is larger. The maximum equivalent residual stress appears in the heat affected zone about 1/2 of the wall thickness from the center of the weld,and the position is related to the shape of the hourglassshaped temperature distribution of the highfrequency induction welding. At the center of the weld,the equivalent residual stress value without considering the change of the microstructure is 1.3 times that of the microstructure change. The distribution of residual stress at the peak of heating temperature and heating range is further quantitatively analyzed. Mastering the characteristics and laws of the highfrequency welding stress and microstructure evolution of welded pipe can provide a theoretical basis for optimizing the design of highfrequency welding process,which is great significance to improving the quality of highfrequency welded pipe further.
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HAN Yi1,XIAO Yao1,MIN Xiangling2,YU Enlin1,LI Dalong1,GAO Ying3. Residual stress and microstructure evolution of high #br#
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