Microstructure and Mechanical Properties of Bobbin Friction Stir Welded Joint of 5 mm Thick 6082-T6 Aluminum Alloy
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摘要: 采用双轴肩搅拌摩擦焊技术对5 mm厚6082-T6铝合金板进行了对接焊，研究了接头的显微组织与力学性能。结果表明：在主轴转速为500 r·min-1、焊接速度为400 mm·min-1条件下焊接后，接头的组织致密，焊核区晶粒细小均匀，热机影响区的晶粒变得狭长，热影响区晶粒粗化；接头的抗拉强度和屈服强度分别为232.75，161.04 MPa，均略低于母材的（272，229 MPa），其弯曲性能合格；显微硬度呈W形分布，硬度最小值出现在前进侧热影响区，为67 HV，焊核区的硬度为77.6 HV。Abstract: 5 mm thick 6082-T6 aluminum alloy plates were butt-welded using the bobbin friction stir welding technique and the microstructure and mechanical properties of the joint were studied. The results show that after welding at the spindle speed of 500 r·min-1 and welding speed of 400 mm·min-1, the microstructure of the joint was dense. The grains in weld nugget zone was fine and even, while in the thermo-mechanical affected zone became long and narrow and in the heat affected zone became coarse. The tensile strength and yield strength of the joint was 232.75, 161.04 MPa, respectively, which were slightly lower than those (272,229 MPa, respectively) of base metal. The bending performance of the joint was qualified. The microhardness showed the W-shape distribution and the lowest value of the hardness appeared in the heat affected zone at the forward side, which was 67 HV. The hardness of the weld nugget zone was 77.6 HV.
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