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A Method for Predicting Prestressed Welding of Skin Flange Structure Welds

A technology of structural welds and prestressing, applied in special data processing applications, instruments, geometric CAD, etc., can solve problems such as high performance and sealing requirements, high structural dimensional accuracy requirements, residual stress and deformation, etc. , to achieve the effect of improving welding quality, reducing welding deformation and reducing stress level

Active Publication Date: 2022-03-04
BEIJING SATELLITE MFG FACTORY
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Problems solved by technology

[0002] In the structure of the sealed cabin of a large spacecraft, a large number of welds between the thin-walled skin and the flange need to be welded. This type of structure not only has high requirements on the performance and sealing of the welds, but also has high requirements on the accuracy of the structural dimensions. To meet the requirements of post-weld combined processing and installation of other components, the residual stress and deformation of the skin flange welded structure welded by the current welding method are more prominent

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  • A Method for Predicting Prestressed Welding of Skin Flange Structure Welds
  • A Method for Predicting Prestressed Welding of Skin Flange Structure Welds

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[0031] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0032] The preset stress welding method is an effective method to realize the welding deformation control of the skin 1-flange 2 structure. Through the finite element calculation of the welding seam welding stress and deformation of the skin 1 flange 2 structure, quantitative analysis can be realized, and a suitable welding method can be formulated. Stress and deformation control measures, based on this, apply preset stress to the weld 3 through the design tooling, so that the weld 3 produces reverse deformation. After the welding is completed, the elastic pre-deformation of the skin 1 and the welding shrinkage deformation cancel each other out, eliminating the need for welding. Deformation, improve the high quality and high reliability of the skin 1 flange 2 welded structure.

[0033] The method proposed by the present invention based on therma...

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Abstract

A method for predicting prestress welding of skin flange structure welds, relates to the field of spacecraft skin flange structure welding technology; comprising the following steps: step (1), establishing a model of the flange and skin; step (2) ), carrying out pre-deformation analysis to the model established in step (1); step (3), heat analysis of welding heat source; step (4), stress deformation analysis of welding process; step (4) includes: S1: Both the side and the inner side of the flange are set as fixed constraints; S2: Constrain the degrees of freedom along the radial direction of the sphere on both sides of the weld; S3: Apply reverse pre-deformation at the circular weld; S3: According to the steps (3), carry out heat source analysis on skin and flange model; S4: Carry out residual stress-strain analysis; The present invention has effectively improved the precision of residual stress level and post-weld deformation of weld seam after welding, and the weld seam that improves Quality, especially for the welding of skin and flange welds in large sealed shell structures has unique advantages.

Description

technical field [0001] The invention relates to the technical field of welded skin flange structures of spacecraft, in particular to a method for predicting prestress welding of skin flange structure welds. Background technique [0002] In the structure of the sealed cabin of a large spacecraft, a large number of welds between the thin-walled skin and the flange need to be welded. This type of structure not only has high requirements for the performance and sealing of the welds, but also has high requirements for the accuracy of the structural dimensions. To meet the post-weld assembly processing and the installation requirements of other components, the residual stress and deformation of the skin flange welded structure welded by the current welding method are more prominent. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a method for predicting the pre-set stress welding of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F119/14
CPCG06F30/15G06F2119/06
Inventor 章朋田黄宁葛一凡魏松杜会桥刘鑫张所来
Owner BEIJING SATELLITE MFG FACTORY
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