中文摘要：

通过正交试验方差分析优化超声冲击处理7A52铝合金焊接接头的工艺参数,以表层晶粒尺寸大小和变形层厚度作为两个综合评定指标,得到其最佳超声冲击处理工艺参数为利用准4 mm的冲击针在260 mm长的焊缝冲击60 min,冲击电流为2.0 A。

英文摘要：

The process parameters for ultrasonic impact treatment of 7A52 A1 alloy welded Joints were optimized by orthogonal experiment variance analysis. The grain size of surface and the thickness of deformation layer is two comprehensive assessment indicators. The results show that the best process parameters are that the diameter of the impact needles is φ4 mm, the impact time is 60 min based on the 260 mm welded joints, and the impact current is 2.0 A.