Residual stress and microstructure evolution of high #br#
frequency welding of longitudinal pipe

HAN Yi1; XIAO Yao1; MIN Xiangling2; YU Enlin1; LI Dalong1; GAO Ying3

doi:10.13228/j.boyuan.issn0449749x.20190151

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Iron and Steel ›› 2019, Vol. 54 ›› Issue (11) : 130-139. DOI: 10.13228/j.boyuan.issn0449749x.20190151

Residual stress and microstructure evolution of high #br# frequency welding of longitudinal pipe

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Abstract

With the rapidly development of crossdisciplines 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 highfrequency 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 hourglassshaped temperature distribution of the highfrequency 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 highfrequency welding stress and microstructure evolution of welded pipe can provide a theoretical basis for optimizing the design of highfrequency welding process，which is great significance to improving the quality of highfrequency welded pipe further.

Key words

welded pipe / high frequency welding / residual stress / stress field / microstructural evolution

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HAN Yi1, XIAO Yao1, MIN Xiangling2, et al. Residual stress and microstructure evolution of high #br# frequency welding of longitudinal pipe[J]. Iron and Steel, 2019, 54(11): 130-139 https://doi.org/10.13228/j.boyuan.issn0449749x.20190151

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