Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent...Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent surface appearance forms, but the interface macrograph for each lap joint cross-section is different. With the increase of welding speed or the decrease of tool rotation rate, the amount of Ti alloy particles stirred into the stir zone by the force of tool pin decreases continuously. Moreover, the failure loads of the lap joints also decrease with increasing welding speed and the largest value is achieved at welding speed of 60 mm/min and tool rotation rate of 1500 r/min, where the interracial zone can be divided into 3 kinds of layers. The microhardness of the lap joint shows an uneven distribution and the maximum hardness of HV 502 is found in the middle of the stir zone.展开更多
采用氢氧微焰实现了ф0.4 mm银丝和ф0.03 mm铂丝异种材料的连接,并通过正交优化设计对工艺参数进行了优化,研究了工艺参数对焊接接头的宏观形貌及拉伸性能的影响。结果表明,焊接接头获得最大抗拉力的最佳工艺参数是:气体压强为10 k Pa...采用氢氧微焰实现了ф0.4 mm银丝和ф0.03 mm铂丝异种材料的连接,并通过正交优化设计对工艺参数进行了优化,研究了工艺参数对焊接接头的宏观形貌及拉伸性能的影响。结果表明,焊接接头获得最大抗拉力的最佳工艺参数是:气体压强为10 k Pa,焊接时间为6 s,焊针直径为22G,焊枪角度为60°时,此时焊接接头可获得最大的抗拉力为170.4 m N。当气体压强、焊接时间过大时,焊点在气体压力和焊接热量共同作用下,导致焊点发生偏移;过小时,由于氢氧焰的熔透能力较弱,导致未能形成完整的焊点,这两者都是导致焊接接头承载能力较差的主要原因。展开更多
基金Project (2011BAB206006) supported by the Natural Science Foundation of Jiangxi Province,ChinaProject (2009ZE56011) supported by the Aviation Science Funds of ChinaProject (GJJ12411) supported by the Education Department of Jiangxi Province,China
文摘Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent surface appearance forms, but the interface macrograph for each lap joint cross-section is different. With the increase of welding speed or the decrease of tool rotation rate, the amount of Ti alloy particles stirred into the stir zone by the force of tool pin decreases continuously. Moreover, the failure loads of the lap joints also decrease with increasing welding speed and the largest value is achieved at welding speed of 60 mm/min and tool rotation rate of 1500 r/min, where the interracial zone can be divided into 3 kinds of layers. The microhardness of the lap joint shows an uneven distribution and the maximum hardness of HV 502 is found in the middle of the stir zone.
文摘采用氢氧微焰实现了ф0.4 mm银丝和ф0.03 mm铂丝异种材料的连接,并通过正交优化设计对工艺参数进行了优化,研究了工艺参数对焊接接头的宏观形貌及拉伸性能的影响。结果表明,焊接接头获得最大抗拉力的最佳工艺参数是:气体压强为10 k Pa,焊接时间为6 s,焊针直径为22G,焊枪角度为60°时,此时焊接接头可获得最大的抗拉力为170.4 m N。当气体压强、焊接时间过大时,焊点在气体压力和焊接热量共同作用下,导致焊点发生偏移;过小时,由于氢氧焰的熔透能力较弱,导致未能形成完整的焊点,这两者都是导致焊接接头承载能力较差的主要原因。
