Microstructure and Mechanical Properties of Welded Joint of
5052-H32 aluminum alloy sheet with the thickness of 2.2 mm was welded by frication stir welding(FSW),and the microstructure of the welded joint was observed,meanwhile,the tensile properties and microhardness at room temperature were tested.The results show that the grain of the welded joint is refined,and the mechanical properties of the welded joint are improved obviously.Under the condition that the rotation speed of 700 r/min and welding speed of 150mm/min,the tensile strength of the welded joint can reach 215 MPa,which is 9% higher than parent material(198 MPa),the yield strength can reach 120 MPa,which is 39% higher than parent material(86 MPa),and the hardness can reach 72 HV,which is 18% higher than parent material(61 HV).