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Efficient weld joint morphology numerical simulation prediction method based on fast Fourier transform

A Fourier transform and numerical simulation technology, applied in CAD numerical modeling, complex mathematical operations, electrical digital data processing, etc., can solve problems such as low prediction efficiency, and achieve the effect of small numerical error and high calculation accuracy

Active Publication Date: 2020-11-17
CHANGSHU INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0004] In order to solve the problem of low prediction efficiency of existing numerical simulation methods for weld topography, the present invention proposes a high-efficiency numerical simulation prediction method for weld topography based on fast Fourier transform

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  • Efficient weld joint morphology numerical simulation prediction method based on fast Fourier transform
  • Efficient weld joint morphology numerical simulation prediction method based on fast Fourier transform
  • Efficient weld joint morphology numerical simulation prediction method based on fast Fourier transform

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Embodiment

[0114] An efficient numerical simulation prediction method for weld seam shape based on fast Fourier transform, including the following steps:

[0115] Step 1: Input laser welding parameters

[0116] The laser power is 1600W, the welding speed is 5mm / s, the shielding gas composition and flow rate are 15L / min, the base metal and welding wire are all made of 6061 aluminum alloy, and the thermal physical parameters are as follows:

[0117]

[0118]

[0119] Step 2: Define the weld topography function

[0120] The surface of the workpiece is defined as the initial weld shape. In order to track the change of the weld shape conveniently, the present invention uses the weld shape function (hyperbolic tangent function H) to solve the weld shape change process, and the weld shape is defined as hyperbolic The 0.5 isosurface of the tangent function, such as figure 2 shown.

[0121] Step 3: Calculate welding heat input

[0122] Using a rotating Gaussian body heat source model (...

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Abstract

The invention discloses an efficient weld joint morphology numerical simulation prediction method based on fast Fourier transform, and aims to solve heat transfer and flow equations in a weld joint forming process based on fast Fourier transform in order to solve the problem that an existing weld joint morphology numerical simulation method is low in prediction efficiency. Therefore, efficient prediction of the weld joint morphology change process is achieved. The method comprises the following steps of firstly, defining an initial weld joint morphology function and inputting welding parameters; secondly, solving a welding heat transfer and flow equation based on fast Fourier transform; further, updating a motion equation of the weld joint morphology function; and finally, outputting a newweld joint morphology function and extracting new weld joint morphology and characteristic parameters. Compared with an existing weld morphology numerical simulation method, the weld prediction efficiency can be effectively improved by dozens, hundreds and even thousands of times, the infinite parallel speed-up ratio is supported, and the calculation efficiency and the calculation precision of the method are far higher than those of an existing method.

Description

technical field [0001] The invention relates to a high-efficiency weld seam shape numerical simulation prediction method based on fast Fourier transform, which belongs to the field of weld seam shape prediction methods. Background technique [0002] Weld seam morphology is a key factor in determining welding forming quality and production efficiency. Accurate prediction of weld morphology has important theoretical value and engineering significance for welding stress deformation analysis, welding metallurgy analysis, welding process design and optimization, etc. [0003] At present, the weld shape prediction mainly adopts numerical simulation method (Zhang Haiquan, Zhang Yanhua, Zhao Haiyan, et al. Prediction model and verification of electron beam weld shape of nickel-based superalloy[J]. Journal of Aeronautical Materials, 2004(05): 24- 28). This type of method is based on numerical algorithms to solve the equations of heat transfer, flow and free surface evolution in the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F17/14G06F111/10G06F113/08G06F119/08G06F119/14
CPCG06F30/28G06F17/142G06F2111/10G06F2113/08G06F2119/08G06F2119/14
Inventor 钱龙根胡月
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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