2024-T4超薄铝合金机器人搅拌摩擦焊接头组织及力学性能

机器人作为搅拌摩擦焊系统的载体时，由于其关节采用串联模式进行连接，在焊接过程中关节易发生变形，而变形的释放会导致焊漏等缺陷，制约了机器人搅拌摩擦焊系统在超薄板焊接过程中的应用. 针对上述问题，文中对0.5 mm厚超薄2024-T4铝合金板进行了机器人搅拌摩擦焊工艺研究. 结果表明，增加下压量或提高主轴转速成功实现薄板铝合金焊接，在主轴转速为2 500 r/min，焊接速度为600 ~ 1 000 mm/min工艺参数内，接头强度呈现升高趋势，最高可达408 MPa，达到母材90%. 接头硬度呈双“W”形分布，其断裂形式为韧性断裂.

Microstructure evolution and mechanical properties of robotic friction stir welded joints of 2024-T4 ultra-thin aluminum alloy

As the carrier of the robot friction stir welding system, the joints of the robot are connected in series mode, which will deform during the welding process. The release of deformation during the ultra-thin plate welding process will lead to defects such as weld leakage, which restricts the robot friction stir welding system Application in the welding process of ultra-thin plates. In this paper, the robot friction stir welding process of 0.5 mm-thick ultra-thin 2024-T4 aluminum alloy plate was studied. The research indicated that: Due to the insufficient rigidity of the robot body, it is necessary to increase the plunge depth or the spindle speed to realize the welding of the ultra-thin plate, When the spindle speed is 2500 r/min and the welding speed is between 600-1000 mm/min, the joint strength shows a rising trend, up to 408 MPa, reaching 90% of the base material. The joint hardness shows a double "W"-shaped distribution. The fracture form is ductile fracture.