Spiral drill pipe: Cold-drawn forming a blade, anneal, good toughness, and durability.
螺旋钻杆：冷拉一次成型叶片，不退火，韧性好，耐用。
Serious necking quality problems often appear when the CFG piles construction technology of long spiral drill pipe by pump pressure apply in some disturbed sensitive soil areas of Taiyuan.
长螺旋钻管内泵压CFG桩施工技术在太原部分地区扰动敏感性土中应用时，常出现严重缩径质量问题。
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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