The mechanical properties and metallographic structures of the friction welded drill rod and the hot upset forged drill rod pipe are compared.
本文叙述了这种钻杆的焊接性，并与采用热镦粗工艺生产的钻杆管体金相组织和机械性能进行了对比。
Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.
整体螺旋加重钻杆是在整体加重钻杆的中间加厚部位延长并铣削螺旋槽。
Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.
整体螺旋加重钻杆是在整体加重钻杆的中间加厚部位延长并铣削螺旋槽。
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