当列车运行时，它与钢轨会有一纵向力的作用（主要是摩擦力），这会使钢轨产生纵向移动，有时甚至带动钢轨一起移动，这种现象就叫做轨道爬行。 轨道爬行往往会引起轨缝不均、轨枕歪斜的线路病害，对轨道的破坏性极大，严重时还会危及行车安全，所以必须采取措施，主要措施是在轨道上安装防爬设施，常用的防爬设施是穿销防爬器和防爬撑。
太空旅客将在他们轨道分离舱的房间里度过三个夜晚，在那里他们身穿维可牢服装，可以像蜘蛛侠(或毒蜘蛛)那样四处爬行了。
Space customers would spend three nights in their orbital pod room, where they could crawl around like Spiderman (or Venom) in Velcro suits.
摘要全位置焊接爬行器配用柔性的钢带轨道可实现空间位置的环缝和直缝焊接。
Absreact the circumferential welding and the straight seam welding at all position can be realizable by using welding crawl equipment for all position together with the flexible metal band track.
全位置焊接爬行器配用柔性的钢带轨道可实现空间位置的环缝和直缝焊接。
The circumferential welding and the straight seam welding at all position can be realizable by using welding crawl equipment for all position together with the flexible metal band track.
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