... extended-nozzle bit 加长喷嘴钻头 bit nozzle 钻头喷嘴 ; 钻头钻管 bit nozzle washed out 钻头水眼刺 ...
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使用1 / 16“钻头，钻一个孔在上面管中间的横截面。这将使天然气逃脱焊接过程。
Using a 1/16" drill bit, drill a hole in the middle of the cross section tube above. This will allow gas to escape during welding."
本文介绍了薄壁管专用钻头的结构特点及工作原理，其结构设计新颖，对薄壁管的钻削有实用价值。
In this paper, the structure feature and principle of this special drill has been introduced. Its special design is very useful for drilling thin-wall pipe.
当取心钻具采用双层管时，钻进所用的钻头就需要用普通双管钻头。
Conventional double tube bits should be used as bits for drilling, while coring tool is double tube.
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