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Method for forecasting welding deformation of multi-layer welding

A welding deformation and multi-layer welding technology, which is applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve problems such as unsuitable welding structures, and achieve the effects of easy implementation, accurate results and simple process

Active Publication Date: 2015-04-29
INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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Problems solved by technology

[0002] The traditional prediction of welding deformation is based on empirical formulas or simple analytical methods, but empirical formulas or simple analytical methods are only suitable for relatively simple component welding situations, and are not suitable for most of the more complex welding structures in actual engineering

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  • Method for forecasting welding deformation of multi-layer welding
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  • Method for forecasting welding deformation of multi-layer welding

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Embodiment Construction

[0026] The present invention relates to a method for predicting welding deformation of multi-layer welding. The method is used to predict the welding deformation of components after n (n ≥ 2, n ∈ Z) layer welding, including the following steps:

[0027] A. Assume the inherent strain ε of the component after welding on the i-th layer i , i(n≥i≥1, ) Welding line energy Q of layer welding i The following relationship exists:

[0028] ϵ → i = f → ( s i , k ) Q i - - - ( 1 )

[0029] in is a continuous smooth function, s i is the cross-sectional area of ​​the i-th layer weld, and k is the correlation coefficient.

[0030] B. Setting The specific e...

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Abstract

The invention discloses a method for forecasting welding deformation of multi-layer welding. The method comprises the steps of firstly assuming that a function relationship exists between the inherent strain and the welding linear energy of a welded component, finding out unknown parameters in the function relationship based on a preliminary experiment result, calculating the inherent strain of each welded layer by utilizing the function relationship and the number of welding strips consumed for welding each layer, obtaining the total inherent strain according to the obtained inherent strain data of each welded layer, and finally calculating the welding deformation of the component after the multi-layer welding through an inherent strain finite element method. According to the method disclosed by the invention, the inherent strain finite element method is used for calculating after the inherent strain of the component after the multi-layer welding is accurately forecasted, and thus the welding deformation of the component after the multi-layer welding can be more accurately forecasted.

Description

technical field [0001] The invention mainly relates to the technical field of welding simulation, in particular to a method for predicting welding deformation of multi-layer welding. Background technique [0002] The traditional prediction of welding deformation is based on empirical formulas or simple analytical methods, but empirical formulas or simple analytical methods are only suitable for relatively simple component welding situations, and are not suitable for most of the more complex welding structures in actual engineering. With the rapid development of modern industry and computer technology, using numerical simulation to predict and control welding deformation and residual stress, so as to select the best process parameters and assembly sequence, has become an important direction of development at home and abroad. [0003] In the process of welding the components, due to the external heat input to the weld seam and its vicinity, and the constraints of the surroundi...

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Application Information

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IPC IPC(8): G06F19/00B23K37/00
Inventor 丁桦黄灏刘红武邓剑蓝林华
Owner INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI