应力场模拟结果显示，清根坡口附近为拉伸残余应力，向板边过渡为压缩残余应力。
The simulation results of stress field show that it is tensile residual stress around the groove, and compressive residual stress with transition to plate edge.
后轮将焊缝金属的纵、横向压缩塑性变形充分碾展，减小了工件的残余变形和应力。
The rear impact roller stretches the weld longitudinally with transverse compressive plastic deformation of the weld, thus reducing the residual deformation and stresses in the bead.
结果表明：随着初始主应力方向角的增大，轴向残余变形由压缩状态的正值逐渐过渡到伸长状态的负值。
The results show that: with the initial principal stress direction angle increases, the axial residual deformation from the compression state gradually transits to the elongation.
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