GENG Ming, WANG Yanan, XIAO Yu, et al.Study on Welding Deformation Control and Simulation for End Wall of CR400BF EMU[J].Electric Welding Machine, 2024, 54(3): 99-104.
GENG Ming, WANG Yanan, XIAO Yu, et al.Study on Welding Deformation Control and Simulation for End Wall of CR400BF EMU[J].Electric Welding Machine, 2024, 54(3): 99-104. DOI: 10.7512/j.issn.1001-2303.2024.03.15.
Study on Welding Deformation Control and Simulation for End Wall of CR400BF EMU
The CR400BF EMU’s body end wall is assembled from closed cavity aluminum alloy extrusions with a significant amount of welding
which results in substantial welding distortion
making size control difficult and affecting vehicle assembly precision and appearance quality. This study investigates methods to control welding distortion in the CR400BF EMU body end walls. By combining welding simulation and actual production
an optimized set of welding distortion control methods for the end walls is proposed from three aspects: structural optimization
pre-welding counter-distortion
and welding process optimization.In terms of structural optimization
an enclosed type extrusion structure with posts is used instead of the traditional open type extrusion structure
which increases the stiffness of the end wall. For pre-welding counter-distortion
effective control of welding distortion is achieved by adjusting the contour curvature of the side bending beams and the assembly width of the external bending beams. Regarding welding process optimization
an alternating “longer then shorter
larger then smaller” front and back welding sequence is employed
and the spacing and number of segmented welds are adjusted to further reduce welding distortion. This ensures the critical dimensions of the end wall
thereby improving product quality and production efficiency.
关键词
CR400BF车体端墙焊接变形模拟仿真结构优化焊前反变形焊接工艺优化
Keywords
CR400BFend wallwelding distortionsimulationstructural optimizationpre-welding counter-distortionwelding process optimization
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