CMT焊与MIG焊TC4钛合金接头温度场与应力场对比分析

IF 0.6 4区工程技术 Q4 MECHANICS

Mechanika Pub Date : 2022-12-05 DOI:10.5755/j02.mech.31491

Rui Zhang, X. Gu, Yuxian Meng, Lijuan Zhu

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引用次数: 1

摘要

基于双椭球体体积热通量随时间间隔的分布，建立了冷态金属转移焊接模型。利用ANSYS软件对TC4钛合金的温度场和应力场进行了数值模拟。研究并比较了CMT和MIG焊接过程中温度、残余应力和焊后变形的分布规律。研究发现，在加载过程中，CMT焊接熔池的最高温度呈波动上升趋势，而MIG焊接熔池温度平稳上升，最高温度高于CMT焊接。采用热应力耦合分析方法对焊接应力场进行了分析。基于MIG焊接热源模拟的应力分布与CMT焊接相似，但最大von Mises应力大于CMT焊接。由于冷却收缩，两者在焊接后都会产生角变形。基于MIG焊接热源模拟的最大角变形大于CMT焊接。焊接仿真结果表明，CMT焊接可以减少焊接热输入，减少焊后残余应力和变形。

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Comparative Analysis of Temperature Field and Stress Field of TC4 Ti-tanium Alloy Joint Between CMT and MIG Welding

A model was used for the cold metal transfer (CMT) welding based on the volume heat flux distribution of double ellipsoids loaded with time intervals. The temperature field and stress field of TC4 titanium alloy were numerically simulated by ANSYS software. The distribution laws of temperature, residual stress and post-weld deformation during CMT and MIG welding were studied and compared. It was found that the maximum temperature of the molten pool in CMT welding was fluctuating and rising during the loading process, while the temperature of the molten pool in MIG welding was rising smoothly and the maximum temperature was higher than that in CMT welding. The welding stress field was analyzed by thermal-stress coupling analysis. The stress distribution simulated based on the MIG welding heat source was similar to CMT welding, but the maximum von Mises stress was greater than that of CMT welding. Due to the cooling shrinkage, both of them would produce angular deformation after welding. And the maximum angular deformation simulated based on the MIG welding heat source was greater than that of CMT welding. It was proved by welding simulation that CMT welding could reduce welding heat input and residual stress and deformation after welding.

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来源期刊

Mechanika 物理-力学

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.