无针搅拌摩擦点焊铝合金搭接接头的组织与性能研究

摘要

Needleless stir head friction welding is applied to the 6005A‐T6 aluminum alloy which is 1 .0+ 1 .5 mm thickness .The microstructures ,tensile properties and fracture morphology are studied ,and the results show that the microstructure of welding are divided into four regions ,in which the finest crystal grain is in the stirred region .The shear resistance at welding joints is significantly higher than that of peeling ,and the staying time of the stir head only influences the peeling property but effect a little to the shear strength .The ductile rupture appears in the fracture morphology of shear .%采用无针式搅拌头对（1．0＋1．5） mm 厚6005A‐T6铝合金进行搅拌摩擦点焊，对焊后组织形貌、拉伸性能和断口形貌研究分析。结果表明，焊点接头组织分为4个区域，其中搅拌区的晶粒最为细小。点焊接头抗剪切性能明显高于其抗剥离性能，搅拌头停留时间的变化仅对剥离性能有所影响，对拉剪性能影响不大，拉剪断口显示为韧性断裂。