Simulation method for welding stress field of flanged edge joint

A technology of crimping joints and welding stress, applied in 3D modeling, special data processing applications, image data processing, etc., can solve problems such as unstable temperature field, unqualified welding, uneven weldments, etc.

Inactive Publication Date: 2017-04-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] Due to the rapid heat conduction in the metal, the highly concentrated instantaneous heat input will generate a considerable temperature gradient during and after welding, resulting in a very uneven and unstable temperature field in the weldment, which will lead to the welding process and Large welding stress and deformation appear after welding, resulting in unqualified welding

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  • Simulation method for welding stress field of flanged edge joint
  • Simulation method for welding stress field of flanged edge joint
  • Simulation method for welding stress field of flanged edge joint

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specific Embodiment approach 1

[0037] Specific Embodiment 1: A method for simulating the welding stress field of a curling joint in this embodiment is implemented in the following steps:

[0038] First, the welding conditions are determined. In this example, the conditions are: welding voltage U=30V, welding current I=250A, and welding speed 0.01m / s. The horizontal flanging of the weldment is 30mm, the vertical flanging is 20mm, the length is 100mm, and the thickness is 5mm. The weldment is symmetrical about the weld. Then proceed to the following steps:

[0039] Step 1: Define the element and material constants in ANSYS: the element type is defined as solid 70, and the material properties include thermal conductivity, density, specific heat capacity, Poisson's ratio, expansion coefficient, elastic modulus, and yield stress;

[0040] The second step: establish the seam joint model and mesh division: obtain the seam joint model by establishing key points and surfaces. Finally, the grid is divided, and the ...

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Abstract

The invention relates to a simulation method for a welding stress field of a flanged edge joint. The method is applied to the field of welding. The simulation method for the welding stress field of the flanged edge joint specifically comprises the steps of a) defining a unit and a material constant; b) building a flanged edge joint model and performing grid division; c) defining a heat source model; d) performing transient heat analysis solving to obtain a temperature field cloud picture; and e) applying a node temperature, obtained by temperature field analysis, as a load to a unit model performing heat-structure conversion so as to obtain a stress field. According to the method, the defects of unfirm welding and easy breaking due to the fact that a solder cannot be well bonded with a raw material when being added for performing welding are overcome; and by adjusting welding parameters of laser, molten metal in a welding position flows downwards along a welding seam under the action of gravity and capillary absorption and is cooled to form a firm welding seam. The method is applied to the field of welding.

Description

technical field [0001] The invention relates to a method for simulating the welding stress field of a seam joint, which is applied in the field of welding. Background technique [0002] The history of laser welding technology in industry is not long, but its development is very rapid. Crimping joint is a commonly used welded joint. According to its structure and characteristics, it is widely used in the production of sensitive components such as food industry, containers, sensors, etc. Poor welding is prone to wavy welds. [0003] Due to the rapid heat conduction in the metal, the highly concentrated instantaneous heat input will generate a considerable temperature gradient during and after welding, resulting in a very uneven and unstable temperature field in the weldment, which will lead to the welding process and Large welding stress and deformation appear after welding, resulting in unqualified welding. Therefore, it is very important to analyze the welding stress field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/20
CPCG06F30/23G06F2119/08G06F2119/18G06T17/205
Inventor 崔永强胡永达包生祥罗川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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