6061-T6铝合金中空薄壁型材双轴肩搅拌摩擦焊工具设计与工艺分析

基于双轴肩搅拌摩擦焊热输入的理论分析，建立了焊接工具结构尺寸特征值与待焊工件厚度之间的工程模型.利用该工程模型，设计并优化得到适用于厚度为2.5 mm的6061-T6铝合金薄板的双轴肩搅拌摩擦焊工具.使用该工具对中空薄壁型材进行焊接，并对焊接工艺参数进行优化. 结果表明，当焊接工具转速为1 000 r/min、焊接速度为600 mm/min时，可以得到综合力学性能最佳的焊接接头，其中正面焊缝焊接接头抗拉强度可达231 MPa，为母材抗拉强度的77%，弯曲角度达180°；反面焊缝焊接接头抗拉强度可达226 MPa，为母材抗拉强度的76%，弯曲角度达180°.

Tool design and process analysis of bobbing tool friction stir welding for thin-walled extrude profile of 6061-T6 aluminum alloy

An engineering model between characteristic value of welding tool and specimen thickness was established based on heat input theoretical analysis of bobbing tool friction stir welding. According to this model, a welding tool was designed and optimized, which was used for join 2.5 mm thin-walled extrude profile of 6061-T6 aluminum alloy. Friction stir welding parameters were optimized as well. When the rotation speed of the tool was 1 000 r/min and welding speed was 600 mm/min, the joint obtained a maximum mechanical properties. The front side joint had a tensile strength of 231 MPa, 77% of the base material, and a bend angle of 180°, while the back side joint had a tensile strength of 226 MPa, 76% of the base material, and a bend angle of 180°.