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。
By means of finite element,stress field theory of TC4 titanium alloy and YG8 cemented carbide vacuum brazing process have been stl,died. 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 1 328 MPa. So the cracks causiug 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.
出处
《电焊机》
2018年第1期5-8,共4页
Electric Welding Machine
