异种铝合金环形构件的搅拌摩擦焊接工艺

Friction Stir Welding Technology for Different Aluminum Alloy Ring Parts

为实现异种铝合金环形构件的高精度装配与连接,文中设计一种卧式串联型轴向移动转径向伸缩的搅拌摩擦焊接工装。结果表明,采用此工装成功实现铝铜系/铝镁系异种铝合金环形构件的高精度装配与高质量焊接,接头内部质量达到了I级接头要求,接头的抗拉强度高于245 MPa,延伸率高于16%,且所有接头均断裂在铝镁系铝合金母材一侧,说明该接头的整体性能要优于铝镁系铝合金母材性能,解决了铝铜系/铝镁系异种铝合金熔焊易出现焊接裂纹的工程难题。

In order to assemble and connect the dissimilar aluminum alloy ring parts accurately, a horizontal friction stir welding tool which can change axial movement into radial expansion was designed. The results show that the Al-Cu/Al-Mg dissimilar aluminum alloy ring parts can be assembled and connected with high precision and high quality. The internal quality of the joint meets the requirement of grade I. The tensile strength and elongation of the joint are higher than 245 MPa and 16% , respectively. Besides, all the joints are broken on the side of Al-Mg based aluminum alloy. It can be concluded that the overall performance of the joint is better than that of Al-Mg based aluminum alloy. Finally, the engineering problem of welding cracks during the Al-Cu/Al-Mg dissimilar aluminum alloy welding is solved.