Research on welding residual stress elimination of aluminum alloy body of high-speed trains by means of ultrasonic impact treatment

XU Ye; HAN Xiaohui; YE Jiehe; WANG Suhuan; LI Shuaizhen

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Research on welding residual stress elimination of aluminum alloy body of high-speed trains by means of ultrasonic impact treatment
Vol. 48, Issue 3, Pages: 65-71(2018)
Published：2018
DOI：
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DOI：

XU Ye, HAN Xiaohui, YE Jiehe, et al. Research on welding residual stress elimination of aluminum alloy body of high-speed trains by means of ultrasonic impact treatment[J]. Eletric Welding Machine2018, 48(3): 65-71. DOI：

摘要

针对6系铝合金焊接接头进行了不同激励电流条件下的全覆盖超声波冲击处理

并运用盲孔法对超声波处理前后的焊接残余应力进行测量分析

通过对比试验效果选择最优激励电流

并在最优激励电流下经超声冲击处理后

截取试样进行拉伸、弯曲试验分析。试验结果表明:超声波冲击处理能够有效消减焊缝及HAZ等局部高应力区的残余应力;随着激励电流的增加

残余应力的消除率相应增大

当激励电流为1.6 A时

超声波冲击处理效果最优

消除率为34%

均化率为44%

焊接接头的拉伸、弯曲等性能均满足标准要求。

Abstract

Aluminum profiles are widely used in the manufacture of high-speed train body

the researh was made of the residual stress

the distribution and residual stress reduction of the key parts of the bolster. Ultrasonic is adopted to eliminate stress on the simulation part

using blind hole method to measure the size of welding residual stress before and after impact

tensile

bending

fatigue test were carried out after the impact of the parts sampling. The results showed that:ultrasonic impact treatment for reducing weld and HAZ high stress zone;as the current increasing

residual stress elimination rate increases accordingly

when the current is 1.6 A

the reducing rate is 33%

the homogenization rate is 44%

welded joint tensile

bending and fatigue performances meet the requirements.