An Integrated Calculation Method for Welding Residual Stress and Deformation of Super-Large Structures
A residual stress and integrated calculation technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve problems such as time-consuming and difficult calculations, and achieve reliable results, good convergence, and fast calculation speed
Active Publication Date: 2020-08-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
This method takes full account of the advantages that the finite element method can realize the global distribution of residual stress, but the same finite element method is also used for the residual stress analysis of large ultra-thick structures (such as hydrogenation reactors, nuclear power pressure vessels, ship structures, etc.) It is obviously inappropriate, because large-scale structures are generally assembled by tailor-welded parts, which contain a large number of welded joints, and each welded joint contains multiple welds. If the finite element method of the conventional moving heat source model is used Simulating welding residual stress will inevitably cause great calculation difficulties and take a long time
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Embodiment 1
[0038] The method of the present invention is used to calculate the welding residual stress and deformation of a large horizontal storage tank pressure vessel. The material used in the horizontal pressure vessel is 304 stainless steel, the diameter of the cylinder is 4m, and the thickness is 16mm, including the girth weld of the cylinder and There are three types of longitudinal weld joints and penetration T-joints. The girth weld and total weld joints are Y-shaped grooves, and the penetration T-joints are X-shaped grooves. The groove angle is 60 degrees.
[0039] According to the method of this application, the welded joints of the pressure vessel of the horizontal storage tank are firstly classified into: Y-shaped groove welded joints of girth welds, Y-shaped groove welded joints of longitudinal welds, and X-shaped groove welded joints of penetration parts Three types of joints, according to the welding process of each welded joint, the equivalent heat source method is used t...
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The invention provides an integrated calculation method for welding residual stress and deformation of a super-large structure, sorts the components according to the manufacturing sequence of the super-large structure, and then sorts the welding joints of each component according to the welding process specifications, sequence and mode of each component ;Classify according to the thickness, type and groove form of different welded joints; for each type of welded joints, establish equivalent samples of welded joints with the same size as the welded joints of the actual super-large structure, and use the equivalent heat source method to simulate various types of welding The residual stress distribution of the equivalent sample of the joint can be obtained to obtain the residual stress of the weld seam and the heat-affected zone of the welded joints of each component, so as to infer the overall residual stress distribution of the super-large structure; according to the position of the equivalent sample of the welded joint of each component, The obtained internal original strain of the joint is used as the initial strain and imported into the overall model of the shell element of the super-large structure for elastic finite element calculation, and finally the deformation distribution of the entire super-large structure is obtained.
Description
technical field [0001] The invention relates to the technical field of welding residual stress and deformation calculation methods, in particular to an integrated calculation method for welding residual stress and deformation of super-large structures. Background technique [0002] With the progress of human civilization, modern container structures are gradually developing towards large-scale. Large-scale containers and structures occupy an increasingly important position in modern industry, and the manufacture of large-scale container structures is often welded by several modules. After the welding is completed, welding residual stress will inevitably be generated at the welded joint, which will affect the strength, creep, fatigue, stress corrosion cracking and other properties of the overall structure. Accurately understanding the overall residual stress and deformation distribution of large vessel structures plays a decisive role in the safe and reliable operation of the...
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IPC IPC(8): G06F30/23G06F30/17
CPCB23K37/00G06F30/17G06F30/23
Inventor 蒋文春罗云涂善东范志超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)