A novel non-keyhole friction stir welding technique was proposed to weld the butt joint of 6061-T6 aluminum alloy with thickness 6 mm. sound obtained by this technique, simultaneously eliminating flash, shoulder mark and keyhole defects. The sleeve directly affected zone (SDAZ) indirectly (SIAZ) were divided into according plunging position hollow sleeve. lack root penetration defect avoided wh...

The reaming process of the 6061 aluminum alloy plate after cold expansion with split sleeve was simulated by finite element (FE) method based on Abaqus/CAE, relationship between depths and distribution residual stress fields is obtained analysis. fatigue lives under different were calculated using analysis software FE-SAFE, verified tests. results show that will increase compressive at hole edg...