G0400203 Damping property of 2024 aluminum alloy Motion welded joint

Abstract

The effect of natural aging on the mechanical and damping property of friction welded small rod of 2024 aluminum alloy joint using micro fiction welding machine was investigated The damping property were direction of torsional on vibration testing system. Microstructure of the weld interlace showed fine grain structure than that of the base metal. The hardness of weld interlace shows higher value than the base metal. Softened zone was observed in welded joint, and joint of 4 days after welding showed higher value than that of the joint of 1 day after welding.The maximum tensile strength of welded joint showed 482 MPa became joint efficiency was approximately 97 % of base metal. Elongation of joints were increased by increasing friction time. Damping capacity of welded joint had increased as the hardness of softened zone with decrease than the base metal.