Method for predicting shape and size of CMT welding seam based on ANSYS

A technology of size and welding process, applied in the field of predicting the shape and size of CMT welds based on ANSYS.

Inactive Publication Date: 2013-10-23
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the main function of SYSWELD is to analyze the structure, deformation, stress and strain of the workpiece after welding, the processing of the simulation process of the welding temperature field is relatively simple, and the influence of various forces on the molten pool is not considered.

Method used

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  • Method for predicting shape and size of CMT welding seam based on ANSYS
  • Method for predicting shape and size of CMT welding seam based on ANSYS
  • Method for predicting shape and size of CMT welding seam based on ANSYS

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Embodiment

[0067] The method for predicting the shape and size of the weld in the Q235 steel plate surfacing process simulation based on ANSYS to predict the CMTQ235 steel plate surfacing process simulation includes the following steps:

[0068] (1) Collect welding process data, including:

[0069] Welding parameters: welding current 234A, welding voltage 21V, wire feeding speed 10.0m / min, welding speed 16.7mm / s

[0070] Material thermophysical parameters: thermal conductivity, specific heat, density (such as figure 2 shown);

[0071] Initial information: weldment size 200mm×50mm×3mm, ambient temperature 20°C;

[0072] (2) Establish finite element analysis model

[0073] Processing of weld reinforcement: In finite element analysis, the weld reinforcement is added to the workpiece in advance, and the element activation method is used in the calculation process to process it; in order to simplify the calculation, the cross-sectional contour curve of the reinforcement is set as: y =ax ...

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Abstract

The invention discloses a method for predicting a shape and a size of a CMT (Cold Metal Transfer) welding seam based on ANSYS. The method comprises the steps that S1, data during a CMT welding course is acquired; S2, a finite element analysis model is established, and reinforcement of the welding seam is processed; S3, mesh dividing is performed; S4, heat source treatment is performed; S5, a governing equation is established; and S6, an transient temperature field is obtained, temperature field distribution is calculated, a time step is calculated, a self-adaption step is adopted, and the shape and the size of the cross section of the welding seam are obtained according to a calculation result of a welding temperature field, and compared with a full size of the welding seam. The prediction is performed based on the following assumptions that a boundary heat transfer condition and a geometrical shape in a width direction are symmetrical, the heat physical property of a material changes with the temperature, and evaporation of metal in a molten pool is not considered. The method is simple, convenient and quick; influences of various force on the molten pool are considered; a result is objective; very high prediction precision of the shape and the size of the CMT welding seam and detailed information of the temperature distribution of the whole CMT welding course can be obtained; set and optimized parameters can be provided for the welding course; and the applicability is high.

Description

technical field [0001] The invention relates to a method for predicting the shape and size of cold metal transfer (Cold Metal Transfer, CMT) weld seam based on finite element (ANSYS). Background technique [0002] Modern manufacturing puts forward high-quality and high-efficiency requirements for the welding production process. In order to improve the welding quality, it is required to reduce the heat input of the arc to the base metal during the welding process, thereby reducing the residual deformation of the workpiece and the size of the heat-affected zone. [0003] Cold metal transfer (Cold Metal Transfer, CMT) technology is a new revolutionary short-circuit transfer technology, which realizes the droplet transfer in the state of no current. When a short circuit occurs, the welding wire stops advancing and automatically withdraws. In this way, the heat input process of the arc itself is very short, the arc is extinguished when a short circuit occurs, and the heat input ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 董重里吴开源兰艳林林介东聂铭李顺华
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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