南京理工大学学报（自然科学版）2025，Vol.49Issue(2)：211-222,243,13.DOI:10.14177/j.cnki.32-1397n.2025.49.02.009
基于超声冲击工艺优化的薄壁件焊接接头残余应力与力学性能研究
Study on residual stress and mechanical properties of welded joints for thin-walled parts based on ultrasonic impact process optimization
摘要
Abstract
In view of the effect of welding residual stress on the bearing capacity and service performance of welding structure,the effect of ultrasonic impact and process parameter optimization on reducing residual stress was investigated,and the numerical simulation of residual stress of welded joints for thin-walled parts of 6061-T6 aluminum alloy and the variation law of mechanical properties were analyzed.Considering the influence of different ultrasonic impact process parameters such as impact frequency,amplitude,and impact velocity on welding residual stress,a predictive relationship model was established with residual stress after impact as the optimization objective.Based on the particle swarm optimization algorithm,the optimal impact process parameters were obtained.What is more,the tensile tests,hardness tests,and electron backscattering diffraction tests were conducted on T-welded joint specimens to reveal the influence of ultrasonic impact on their mechanical properties.The results show that the optimal ultrasonic impact process parameters are obtained with the established predictive relationship model,with a correlation coefficient R2 of 0.99,and the accuracy of the predictive relationship model is effectively verified.Moreover,comparing with the results before ultrasonic impact treatment,the average residual stress and maximum grain size respectively decrease by about 32%and 17%,and the maximum hardness value increases by about 43%.The ultrasonic impact treatment can effectively improve the hardness in welded joints and refine the microstructure grain of weld,which will provide a theoretical analysis basis for improving the service performance of large-scale welding structure of thin-walled parts in the future.关键词
超声冲击/T型焊接接头/残余应力/力学性能/工艺参数优化Key words
ultrasonic impact/T-welded joint/residual stress/mechanical properties/process parameter optimization分类
金属材料引用本文复制引用
潘明辉,孙奥林,陈文韬,李先通,李翔飞,徐亚栋,汤文成..基于超声冲击工艺优化的薄壁件焊接接头残余应力与力学性能研究[J].南京理工大学学报（自然科学版）,2025,49(2):211-222,243,13.基金项目
中央高校基本科研业务费专项资金(30923011038) （30923011038）
江苏省基础研究计划(自然科学基金)(BK20200470) （自然科学基金）
中国博士后科学基金(2021M691595) （2021M691595）
