Optical coherence tomography(OCT)allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole depth and can be used for process monitoring and control.When OCT measurement was take...Optical coherence tomography(OCT)allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole depth and can be used for process monitoring and control.When OCT measurement was taken during single-beam laser welding,the keyhole instability of aluminum welding resulted in highly scattered OCT data and complicated the welding depth extraction methods.As a combination of an inner core beam and an outer ring beam,a novel adjustable ring mode(ARM)laser for producing a stable keyhole was applied to the OCT measurement.Different ARM laser power arrangements were conducted on aluminum and copper.The results indicated that the ring beam greatly improved the stability of the core beam-induced keyhole,and smooth welding depth can be extracted from the concentrated OCT data.展开更多
紧凑型输电线路的相间舞动一直是影响线路安全运行的因素之一,舞动跳闸的重合成功率较低,造成线路停运的几率大。特别是500 k V紧凑型线路,一旦发生舞动事故,将对系统造成很大影响,严重影响供电可靠性。目前,安装相间间隔棒是紧凑型线...紧凑型输电线路的相间舞动一直是影响线路安全运行的因素之一,舞动跳闸的重合成功率较低,造成线路停运的几率大。特别是500 k V紧凑型线路,一旦发生舞动事故,将对系统造成很大影响,严重影响供电可靠性。目前,安装相间间隔棒是紧凑型线路最直接最有效的防舞措施,但现阶段相间间隔棒采取绞链式+球窝联结,该种联结金具是非标产品,联结金具长度调节范围小,安装和调整较为困难,且容易造成相间间隔棒球头部位受到集中应力,引起相间间隔棒球头断裂。针对500 k V紧凑型线路相间间隔棒球头断裂的情况,通过开展相间间隔棒联接方式的研究,研制了相间间隔棒配套用4点连接子导线间隔棒,并在数条500 k V紧凑型线路挂网试运行,效果良好。展开更多
基金supported by the National Natural Science Foundation of China(No.12002215)the China Postdoctoral Science Foundation(No.2022T150437)the National Key Research and Development Program of China(No.2019YFC1511102)。
文摘Optical coherence tomography(OCT)allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole depth and can be used for process monitoring and control.When OCT measurement was taken during single-beam laser welding,the keyhole instability of aluminum welding resulted in highly scattered OCT data and complicated the welding depth extraction methods.As a combination of an inner core beam and an outer ring beam,a novel adjustable ring mode(ARM)laser for producing a stable keyhole was applied to the OCT measurement.Different ARM laser power arrangements were conducted on aluminum and copper.The results indicated that the ring beam greatly improved the stability of the core beam-induced keyhole,and smooth welding depth can be extracted from the concentrated OCT data.
文摘紧凑型输电线路的相间舞动一直是影响线路安全运行的因素之一,舞动跳闸的重合成功率较低,造成线路停运的几率大。特别是500 k V紧凑型线路,一旦发生舞动事故,将对系统造成很大影响,严重影响供电可靠性。目前,安装相间间隔棒是紧凑型线路最直接最有效的防舞措施,但现阶段相间间隔棒采取绞链式+球窝联结,该种联结金具是非标产品,联结金具长度调节范围小,安装和调整较为困难,且容易造成相间间隔棒球头部位受到集中应力,引起相间间隔棒球头断裂。针对500 k V紧凑型线路相间间隔棒球头断裂的情况,通过开展相间间隔棒联接方式的研究,研制了相间间隔棒配套用4点连接子导线间隔棒,并在数条500 k V紧凑型线路挂网试运行,效果良好。
