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RISS 인기검색어
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- 저자 : Shusen Zhao (검색결과 2 건)
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Shusen Zhao,Yanmin Li,Rui Huang,Zhanshu He 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
In this paper, three methods of adding and activating weld bead elements, i.e., adding and activating the weld bead segment by segment (case A), adding and activating one weld pass after another (case B), and modified adding and activating one weld pass after another (case C), were employed to establish the corresponding simulation model of a butt joint of AA6061-T6 mid-thick plate with a double-pass weld by ABAQUS. The welding temperature field, residual stress field, and welding deformation were simulated. The heat loss of three methods in the welding simulation was tested by theoretical calculation. To verify the simulation results, the metal-inert gas (MIG) welding experiment was also performed, and the molten pool dimensions, residual stress, and welding deformation were measured. The results show both cases A and C can be effectively employed to predict residual stress, and case C can also save computing time. Case A can more accurately predict the welding deformation.
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Shusen Zhao,Yanmin Li 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.6
When manufacturing aluminum alloy space-frame radomes, the vertical welding distortion is the main factor that affects assembly accuracy, and the residual stress affects the service performance. This paper aims to decrease welding distortion while ensuring that the residual stress is within the appropriate range by adjusting welding direction and sequence. The thermal-elastic–plastic finite element method is used to predict the welding distortion and residual stress in mid-thick aluminum plate-sleeve structures. The numerical model was verified by experimental results of temperature, vertical distortion, and residual stresses. The effect of welding direction and sequence on the distortion and residual stress was examined by the numerical model. Results indicate that the welding direction significantly affects the distribution and magnitude of X-direction distortion (longitudinal shrinkage) but has little effect on vertical distortion and residual stress. The welding sequence significantly affects the magnitude of vertical distortion and the distribution of residual stress. Then, considering the vertical distortion and residual stress, a scheme (Case 3) is recommended for welding mid-thick aluminum plate-sleeve structures. The maximum vertical distortion of the current production scheme (Case 1) and final determined scheme (Case 3) are 5.43 mm and 2.73 mm, and the corresponding maximum tensile residual stress is 186.5 MPa and 193.8 MPa, respectively. Comparing Case 1 with Case 3, Case 3 can reduce the vertical distortion by 49.7%, while the maximum tensile residual stress of the two is close, and the difference is less than 10 MPa.
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