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本文运用断裂力学分析了国内大型竖井钻机套接塞焊结构钻杆及中心管的断裂原因,总结了对接焊钻杆使用寿命长的特点及原因,并对大型竖井钻机的钻杆选材及焊后回火处理提出了进一步改进意见。
In this paper, fracture mechanics is used to analyze the reason of the fracture of the drill pipe and center pipe in the jacking welding structure of the domestic large-scale vertical shaft drilling rig. The characteristics and causes of the long service life of the butt welding drill pipe are summarized. Tempering proposed further improvements.