The basic principle and the method of oil drill pipe end upsetting process were presented.

介绍了石油钻杆端部镦锻加厚工艺基本原理及加厚方式.

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The design of non - dig drill pipe end - upsetting product line autocontrol system were introduced in this paper.

介绍了 非 开挖钻杆管端加厚生产线自动控制系统的设计.

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