... 0201器件在生产过程中的主要缺陷:墓碑现象(Tombstone) 焊接架桥(Solder Bridging) 刷过程中的影响。在一块PCB上,可能有几百个元器件,600~1000个land(即焊盘pad), ...
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目前,国内在铁路架桥机钢结构的制造及焊接工艺方面,还没有专门的规范或规程。
At present, there is not special technological criterion or specification in China for manufacturing and welding steel structure of railway bridge girder erecting machine.
以A NSYS为分析工具,对铁路架桥机导梁焊接缺陷进行有限元分析,为导梁进行结构安全评定提供依据。
The finite element analysis of the bridge-erecting machine 'beam under welding defect conditions is conducted with ANSYS program, which provides a basis for the structural safety assessment of beam.
随着整体节点正逐渐在大跨度钢桁架桥设计中被采用,在交通荷载作用下焊接局部的疲劳问题日益引起人们的重视。
Along with the wider use of monolithic joint in the design of long span steel truss Bridges, the fatigue of weld details under traffic loads gradually attracted more attention of the architects.
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