有限元法在钎焊中残余应力的分析及应用

刘海汉; 李强; 陈小勇; 杜娜; 董树勋

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有限元法在钎焊中残余应力的分析及应用
Analysis and application of the residual stress in vacuum brazing by finite element method
2018年48卷第1期页码：5-8
纸质出版：2018
DOI：
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刘海汉, 李强, 陈小勇, 等. 有限元法在钎焊中残余应力的分析及应用[J]. 电焊机, 2018,48(1):5-8. DOI：

LIU Haihan, LI Qiang, CHEN Xiaoyong, et al. Analysis and application of the residual stress in vacuum brazing by finite element method[J]. Eletric Welding Machine2018, 48(1): 5-8. DOI：

摘要

采用有限元方法研究TC4钛合金和YG8硬质合金异种材料的真空钎焊工艺。根据焊接残余应力场传导方程、边界条件、初始条件

利用ANSYS软件实现焊接残余应力场仿真。采用abaqus6.11软件平台

以镍基钎料为例

基于Mises应力应变准则计算出焊后接头残余应力水平

结果表明残余拉应力集中分布于硬质合金一侧

最高值达1328 MPa。据此推测应力裂纹应产生于钎料/硬质合金侧

理论分析与试验结论一致。试验结果表明

采用有限元法对控制真空钎焊过程中焊缝处的裂纹有重要的指导意义。

Abstract

By means of finite element

stress field theory of TC4 titanium alloy and YG8 cemented carbide vacuum brazing process have been studied. According to the conduction equation

boundary conditions and initial conditions

the stress field was simulated.Using abaqus6.11 software platform

nickel-based solder as an example

based on the Mises stress-strain criterion to calculate the post-weld residual stress level

a conclusion can be drawn that the main residual stress exist at the side of hard alloy

and its maximum is 1328 MPa. So the cracks causing by thermal stress should exist the position of maximum stress

and this theoretical result is consistent with experiment result. The test results show that the finite element analysis has important guiding significance for the crack control at the welding seam during the vacuum brazing process.