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Ansys-based copper alloy flat plate butt-welding hot crack prediction method

A technology of plate docking and prediction method, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., to achieve the effect of reducing welding process tests, saving manpower and material resources, and reducing the occurrence of thermal cracks

Active Publication Date: 2019-10-22
FOSHAN UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for predicting thermal cracks in butt welding of copper alloy flat plates based on ansys, aiming at the shortcomings of existing cracks caused by excessive welding stress

Method used

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  • Ansys-based copper alloy flat plate butt-welding hot crack prediction method
  • Ansys-based copper alloy flat plate butt-welding hot crack prediction method
  • Ansys-based copper alloy flat plate butt-welding hot crack prediction method

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Embodiment 1

[0044] Embodiment 1: An ansys-based method for predicting thermal cracks in copper alloy flat plate butt welding, including: S1: determine the parameters of the welding process; S2: determine the properties of the welding material: determine the thermal analysis physical parameters and stress analysis parameters of the copper alloy casting : temperature range, density, thermal conductivity, specific heat capacity, enthalpy, total heat transfer coefficient for radiation and convection, elastic modulus, yield strength and shear modulus, linear expansion coefficient, Poisson's ratio; S3: Create finite elements in ANSYS Model, select the thermal analysis unit, and divide the grid by sweeping according to the size of the finite element model; S4: Select the heat source model: select the heat source model according to the welding process conditions; S5: Calculate the temperature field: simulate through the birth and death unit For the movement of the heat source, the heat source calc...

Embodiment 2

[0047] Embodiment 2: A method for predicting thermal cracks in butt welding of copper alloy flat plates based on ansys, including:

[0048] S1: Determine the parameters of the welding process;

[0049] S2: Determine the properties of the welding material: determine the thermal analysis physical parameters and stress analysis parameters of copper alloy castings: temperature range (°C), density (kg / m3), thermal conductivity (W / (m*K)) (considering the molten pool convection), specific heat capacity (J / kg / K), enthalpy (J / M3), total heat transfer coefficient for radiation and convection (W / m^2*K), modulus of elasticity (pa), yield strength and shear modulus volume, coefficient of linear expansion, Poisson's ratio;

[0050] S3: Create a finite element model in ansys, select a thermal analysis unit, and divide the grid by sweeping according to the size of the finite element model; the analysis unit uses solid70.

[0051] S4: Select the heat source model: select the heat source mode...

Embodiment 3

[0069] Embodiment 3: On the basis of Embodiment 2, this embodiment can be replaced by, specifically

[0070] In summary, a method for predicting thermal cracks in copper alloy flat-plate butt welding based on ansys of the present invention determines optimal welding process parameters and reduces thermal cracks by analyzing the ratio of copper alloy flat-plate butt welding welding process parameters through a numerical simulation model The numerical simulation model reduces the number of welding process tests and saves manpower and material resources to the greatest extent; it can predict the distribution of residual stress, so as to provide a post-weld heat treatment plan in time.

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Abstract

The invention provides an Ansys-based copper alloy flat plate butt-welding hot crack prediction method. The method comprises the steps of S1, determining the parameters of a welding process; S2, determining the attributes of a welding material; creating a finite element model in ansys, selecting a thermal analysis unit, and dividing grids in a sweeping mode according to the size of the finite element model; S4, selecting a heat source model: selecting the heat source model according to the welding process conditions; S5, calculating a temperature field; S6, calculating a stress field; and S7,predicting the possible positions of the hot cracks according to the residual stress and deformation. According to the copper alloy flat plate butt welding hot crack prediction method based on ansys.The copper alloy flat plate butt welding technological parameters are analyzed through the numerical simulation model. The optimal welding technological parameters are determined, and generation of hot cracks is reduced; and welding process tests are reduced through a numerical simulation model, and manpower and material resources are saved to the maximum extent.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an ansys-based method for predicting thermal cracks in butt welding of copper alloy flat plates. Background technique [0002] When copper alloy castings have defects and need to be repaired by welding, due to the large linear expansion coefficient of copper alloys, which is almost 50% larger than that of low-carbon steel, the shrinkage rate when changing from liquid to solid is also large. For rigid castings, welding When the residual stress is large, the thermal crack is mainly caused by the residual stress. When the internal residual stress exceeds the ultimate strength of the part, it will cause serious deformation and destructive cracking of the component. Therefore, through the ANSYS software simulation calculation, a reasonable prediction of the residual stress is made, the welding process is optimized, and the welding hot cracks of the copper alloy casting are avoided as...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/08G06F30/23
Inventor 张时旻
Owner FOSHAN UNIVERSITY
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