螺纹搅拌针直径对铝/钢填丝搅拌摩擦焊接头组织及性能的影响

目的 采用填丝搅拌摩擦焊方法 ,研究螺纹搅拌针直径对6061铝合金/304不锈钢搅拌摩擦焊接接头组织及性能的影响.方法 通过使用3种不同直径的螺纹搅拌头,观察不同结构搅拌头对焊缝成形及接头微观形貌的演变规律,并对其进行力学性能测试,研究搅拌头结构对接头性能强化的影响.结果 随着螺纹搅拌针直径由M4增加到M6,焊缝表面成...

Effect of Diameter of Thread Stirring Pin on Microstructure and Properties of Friction Stir Welded Joint of Al/Steel with Interlayer

The work aims to study the effect of the diameter of thread stirring pin on the microstructure and properties of 6061 aluminum alloy/304 stainless steel friction stir welding joint through wire filling friction stir welding. By using thread stirring heads of three kinds of different diameter, the evolution law of weld formation and joint micro morphology was observed, and the mechanical properties were tested to study the influence of the structure of stirring head on the joint performance strengthening. When the diameter of the thread stirring needle increased from M4 to M6, the weld surface became rough gradually, and large-scale steel chips were likely to be produced in the joint weld; In addition, with the increase of the diameter of the thread stirring pin, hook defects were likely to form at the joint interface, and steel chips were likely to gather in the area near the interface; Therefore, the tensile strength of the joint decreased with the increase of the diameter of the thread stirring pin. When the diameter of the thread stirring needle was M4, the tensile strength of the joint reached the maximum value of 156 MPa. Through the use of M4 diameter thread stirring head, the joint with the best comprehensive performance can be obtained.