6A02铝合金双面搅拌摩擦焊工艺及接头力学性能研究

分析20 mm厚6A02铝合金双面搅拌摩擦工艺对接头组织及常规力学性能的影响,并研究了拉伸和疲劳裂纹断口特征,研究结果表明:搅拌针针长的不同会明显影响6A02铝合金双面搅拌摩擦焊接头力学性能;当针长过短时,接头横向侧弯试样中心极易出现裂纹,疲劳试验在指定的循环载荷与应力比的条件下无法达到指定的循环次数即发生断裂;当针长...

Study on double-sided friction stir welding technology and joint mechanical properties of 6A02 aluminum alloy

In this paper,the influence of 20 mm thick 6A02 aluminum alloy double-sided friction stir process on the joint microstructure and conventional mechanical properties is analyzed,and the tensile and fatigue fracture characteristics are studied.The results show that the different lengths of the stirring needles will significantly affect the mechanical properties of 6A02 aluminum alloy double-sided friction stir welded joint.When the needle length is too short,it is easy to appear cracks in the center of the transverse lateral bending specimen of the joint.When the fatigue test fails to reach the specified number of cycles under the condition of specified cyclic load and stress ratio,fracture occurs.When the needle length matches with the pressure,the tensile,bending and fatigue test performance are good,and it is found that the tensile strength of the joint increases first and then reduces as the needle length of stirring increases.When the stirring needle length is 11 mm,the tensile strength of the joint can reach 244 MPa,which is 82.7%of the tensile strength of the base material.