Abstract
To reduce the residual stress and deformation of the copper alloy sheet after welding, and improve the welding quality of the copper alloy sheet, the finite element method (FEM) research on welding thermal deformation and welding sequence optimization was carried out. First, a finite element model of copper alloy sheet welding was established based on ANSYS, the mechanical property parameters of the model at high temperature were determined, and the thermal–structural coupling calculation was performed on the model. Then, the change trend and magnitude of the residual stress and deformation of the model after welding were analyzed. Finally, different welding sequence schemes were designed, and numerical simulation calculations were carried out. The results of the welding sequence solution show that the change trend of the residual stress after welding of the base metal under different welding sequences is basically the same; repeated heating of the base metal at the same position causes large residual stress; the weldment vertical plate is subjected to opposing forces in the x-axis and y-axis directions at the same time. Among four welding schemes, the welding scheme that alternately welds symmetrically from the start and end positions of the weld seam to the middle position of the plate causes the least welding deformation. Compared with the other three schemes, its deformation reduces by 26.6%, 18.3%, and 19.4%, respectively.
Highlights
Copper alloys are widely used in the manufacture of propellers, seawater piping systems, pump valves, and other structural parts in shipbuilding because of their good seawater corrosion resistance
The finite element model of the welded structure was established, and the thermal-structural coupling calculation was performed on the model; the magnitude and change trend of the residual stress and deformation of the model after welding were analyzed; different welding sequence schemes were designed, and numerical simulation calculations were carried out; the welding deformation trends and laws of the curved weld structure were summarized according to the analysis results, which play a guiding role in the actual production of copper alloy sheet curved welds
Among the four welding schemes, the welding deformation caused by scheme 3 is the smallest, and compared with scheme 1, scheme 2, and scheme 4, it is reduced by 26.6%, 18.3%, and 19.4%, respectively
Summary
Copper alloys are widely used in the manufacture of propellers, seawater piping systems, pump valves, and other structural parts in shipbuilding because of their good seawater corrosion resistance. The finite element model of the welded structure was established, and the thermal-structural coupling calculation was performed on the model; the magnitude and change trend of the residual stress and deformation of the model after welding were analyzed; different welding sequence schemes were designed, and numerical simulation calculations were carried out; the welding deformation trends and laws of the curved weld structure were summarized according to the analysis results, which play a guiding role in the actual production of copper alloy sheet curved welds. Physical performance parameters such as material density, thermal conductivity, specific heat capacity, and elastic modulus need to be set to effectively change with temperature during simulation, which is the prerequisite for obtaining reliable calculation results in accordance with actual working conditions. The Poisson’s ratio μ was set to 0.337 in this paper because its variation range was small, and its influence on the calculation results was negligible
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
