| Study on stress and deformation of keyhole gas tungsten arc-welded joints |
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| 作者姓名： | 韩涛 谷世伟 徐良 张洪杰 欧阳凯 |
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| 作者单位： | 1. ;2. |
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| 基金项目： | Key Research and Development Project of Shandong Province(2016ZDJS05B03);Key Research and Development Project of Shandong Province(2017CXGC0812)。 |
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| 摘 要： | Keyhole gas tungsten arc welding(K-TIG)of Q345 low alloy steel plates was simulated by using SYSWELD software.The temperature field of the K-TIG welding process was simulated with three different combined heat sources and was compared with the weld profile that was obtained experimentally.The temperature field that was obtained by a combination of a double ellipsoid heat source on the upper half and a three-dimensional Gauss heat source on the lower half was similar to the real situation.The effects of plate thickness,gap and welding speed on the deformation and stress of the K-TIG welded joints were investigated by K-TIG welding numerical simulation.A reduction in the thickness of the weld plates reduced the z-direction deformation and transverse residual stress;an appropriate gap reduced the residual stress and an increase in the welding speed reduced deformation after welding,but did not help to control the residual stress after welding.
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| 关 键 词： | keyhole gas tungsten arc welding numerical simulation DEFORMATION residual stress |
| 收稿时间： | 2019/8/11 0:00:00 |
Study on stress and deformation of keyhole gas tungsten arc-welded joints |
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| Tao Han,Shiwei Gu,Liang Xu,Hongjie Zhang,Kai OuYang.Study on stress and deformation of keyhole gas tungsten arc-welded joints[J].China Welding,2020,29(1):17-25. |
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| Authors: | Tao Han Shiwei Gu Liang Xu Hongjie Zhang Kai OuYang |
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| Affiliation: | 1. China University of Petroleum (East China), Qingdao 266580, China;2. Harbin Modern Welding Technology Co., Ltd, Harbin 150028, China |
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| Abstract: | Keyhole gas tungsten arc welding (K-TIG) of Q345 low alloy steel plates was simulated by using SYSWELD software. The temperature field of the K-TIG welding process was simulated with three different combined heat sources and was compared with the weld profile that was obtained experimentally. The temperature field that was obtained by a combination of a double ellipsoid heat source on the upper half and a three-dimensional Gauss heat source on the lower half was similar to the real situation. The effects of plate thickness, gap and welding speed on the deformation and stress of the K-TIG welded joints were investigated by K-TIG welding numerical simulation. A reduction in the thickness of the weld plates reduced the z-direction deformation and transverse residual stress; an appropriate gap reduced the residual stress and an increase in the welding speed reduced deformation after welding, but did not help to control the residual stress after welding. |
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| Keywords: | keyhole gas tungsten arc welding|numerical simulation|deformation|residual stress |
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