Numerical Simulation of Welding V-N-Cr Microalloyed Steel Based on SYSWELD

MA Mengze; ZHENG Xiaoming; YANG Ao; LIU Yue; FENG Xiaoyong

doi:10.3969/j.issn.1674-6457.2025.10.022

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (10) : 216-223. DOI: 10.3969/j.issn.1674-6457.2025.10.022

Refractory Metal Forming

Numerical Simulation of Welding V-N-Cr Microalloyed Steel Based on SYSWELD

MA Mengze¹, ZHENG Xiaoming¹, YANG Ao¹, LIU Yue^1,*, FENG Xiaoyong²

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Abstract

The work aims to perform numerical simulation on the welding of V-N-Cr microalloyed steel T-joints by Visual-Environment welding simulation software and Sysweld solver, combined with the double ellipsoid welding heat source model, and investigate the temperature field distribution characteristics, phase transition behaviors, and residual stress generation mechanisms in the weld center and its surrounding area. An accurate T-joint model was created in Solidworks and imported into Visual mesh for meshing. A total of 20 960 2D units, 70 300 3D units and 77 556 nodes were divided to ensure the accuracy of the simulation results. The welding parameters were set to 10 kJ/cm of line energy input, 5 mm/s of welding speed and 200 s of air cooling period. In the boundary condition settings, the heat transfer between the base material and the surrounding medium was calculated according to Newton's cooling law and Stephan-Boltzmann's law, and a rigid fixed constraint was applied to restrict the free movement of the weldment. During welding, the temperature at the center of the weld could reach about 2 750 ℃, while the maximum temperature of the base material not involved in welding was about 617 ℃, which did not exceed the austenite transformation temperature A_c3 of V-N-Cr microalloyed steel. After welding, the microstructure of the weld was mainly composed of ferrite (56%) and bainite (63%). The residual stress analysis showed that the maximum equivalent stress was 565.826 MPa, the transverse residual stress was 555.572 MPa, and the longitudinal residual stress was 533.444 MPa, with a difference of only 12.128 MPa. The maximum deformation of 0.261 mm occurred about 15 mm from the end of the weld. The welding process parameters used in this study can effectively control the temperature field distribution, phase transformation behavior and residual stress generation during the welding process, thereby significantly reducing welding deformation. This result shows that the welding process parameters result in a weld joint with a uniform residual stress distribution, low deformation and good welding quality.

Key words

Sysweld / V-N-Cr microalloyed steel / temperature field / phase transition / stress and strain

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MA Mengze, ZHENG Xiaoming, YANG Ao, LIU Yue, FENG Xiaoyong. Numerical Simulation of Welding V-N-Cr Microalloyed Steel Based on SYSWELD[J]. Journal of Netshape Forming Engineering. 2025, 17(10): 216-223 https://doi.org/10.3969/j.issn.1674-6457.2025.10.022

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Funding

National Key Research and Development Program of China (2022YFB3705200); Hebei Province Innovation Capability Enhancement Program Project (24461002D); Innovation and Entrepreneurship Training Program for Students of North China University of Technology (S202410081019)