三棱钻杆在松软突出煤层中应用广泛,但在使用过程中发现,公母接头同轴度超差,钻杆在连接处弯曲,导致钻杆与导向套铜套摩擦且在薄弱处易发生断裂。为解决这一问题,设计了焊接工装,简要叙述了该工装主要零件的设计。实践证明,使用该工装可有效地解决三棱钻杆同轴度超差的问题,钻杆质量得到进一步的提升。 Triangular drill pipe is widely used in soft and salient coal seam. However, during the process of using, it is found that the coaxiality of the male and female joints is too poor and the drill pipe is bent at the joint, resulting in the friction between the drill pipe and the guide bush and the weakness fracture. To solve this problem, the design of the welding tooling, a brief description of the tooling of the main parts of the design. Practice has proved that the use of the tooling can effectively solve the problem of triaxial drill pipe overbalance, drill pipe quality has been further improved.