2024-T42铝合金点焊接头性能研究

为改善高强铝合金接头连接性能,提高焊接质量,研究了2024-T42铝合金回填式搅拌摩擦点焊(RFSSW)、电阻点焊和铆接3种不同接头的连接性能,采用显微组织观察试验、拉伸试验、拉剪试验和显微硬度试验等方法,对接头组织和性能进行表征与分析.结果 表明:RFSSW接头的力学性能最优,拉剪性能达到7.23 kN,较铆接和电阻...

Research on performance of 2024-T42 aluminum alloy spot welded joints[JP]

In order to improve the connection performance and welding quality of high-strength aluminum alloy joints,the performance of three different connection joints,namely 2024-T42 aluminum alloy refilled friction stirring spot welding (RFSSW),resistance spot welding and riveting,was characterized and analyzed by microstructure observation tests,tensile tests,tensile shear tests and microhardness tests.The results show that the mechanical properties of the RFSSW joint are the best,and the tensile shear property is 7.23 kN,which is 115.82% higher than riveting property and 37.45% higher than resistance spot welded joint;the pull-off mechanical property is 3.09 kN,which is 3.69% higher than riveting and 137.69% higher than resistance spot welded joint;the microhardness of RFSSW joint is the highest,which is close to the base metal,while the microhardness of resistance spot welded joint is the lowest,which is only 50% of the base metal.The fracture morphology of RFSSW and resistance spot weld joints are ductile fracture and mixed fracture,respectively.Using RFSSW method can improve the joint performance of aluminum alloy spot welding,which provides a theoretical and technical basis for the application of aluminum alloy structural spot welding.