Welding seam image extraction fitting-based welding stress deformation prediction method and system

Abstract

The invention discloses a welding seam image extraction fitting-based welding stress deformation prediction method and system, and belongs to the field of welding machining. The method comprises the steps of 1, obtaining a contour line based on a welding seam image, and performing fitting to form a function curve; 2, building a three-dimensional geometric model of welding seam appearance based onthe function curve, dividing a temperature field unit in the three-dimensional geometric model, and setting a thermophysical parameter, a thermal input and a boundary loading quantity of a welding material, thereby obtaining a transient temperature field; and 3, selecting a stress field unit from the three-dimensional geometric model, setting a mechanical physical parameter of the welding material, and loading a parameter of the transient temperature field to a node corresponding to the stress field unit, thereby obtaining transient stress and deformation distribution. The system comprises a module for executing the method. The temperature field is accurately simulated through image extraction and fitting; the problem of poor precision of non-uniform temperature field simulation is effectively solved; and accurate simulation calculation of stress deformation of a welding process is ensured.

Description

technical field [0001] The invention belongs to the field of welding processing, and more specifically relates to a welding stress deformation prediction method and system based on welding seam image extraction and fitting. Background technique [0002] At present, fusion welding (laser welding, arc welding, electron beam welding, etc.) is one of the important processes in the manufacture of complex structural parts, and has been widely used in many fields such as aviation, aerospace, marine, and energy. During the welding process, the heat source and its surroundings are rapidly heated to melt, which will squeeze the surrounding solid metal; during the cooling process of the weld after the heat source passes, the surrounding solid metal will be stretched. The local extrusion effect caused by the rapid melting process of the weld leads to the internal mechanical imbalance of the weld and its surroundings, which will inevitably cause stress deformation and seriously affect th...

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Problems solved by technology

[0009] In view of the above defects or improvement needs of the prior art, the present invention provides a welding stress deformation prediction method and system based on weld image extraction and fitting, the purpose of which is to accurately simulate the temperature field through image extraction and fitting, thereby effectively solving the problem of The temperature field simulation accuracy problem of full penetration welding with necking characteristics and dissimilar material welding is poor to ensure accurate simulation calculation of stress and deformation in the welding process

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