在岩心钻探工作过程中，钻杆承受着各种的应力。首先，钻机通过钻杆迴转全套钻具、克服孔内磨擦力并进行破碎岩石（尅取或研磨），同时通过钻杆传递或平衡孔底所需的轴心压力；其次，水泵通过钻杆向孔底输送具有高压力的冲洗液以冷却钻头及排除岩粉；至于经常地提升和下降钻具，采取岩心，钻进时适当地提动钻具（特别是采用无泵钻进和钻粒钻进时须节奏地提动钻具离开孔底）也全赖钻杆进行；这 Drilling rods are subject to a variety of stresses during core drilling. First of all, the drilling rig turns a full set of drilling tools through the drill pipe to overcome the friction in the hole and to crush the rock (gob or grind) while transmitting or balancing the axial pressure required by the bottom of the drill pipe. Secondly, To the bottom of the hole to send a high pressure of the rinse liquid to cool the drill bit and remove the rock powder; As for the regular lifting and lowering of the drill, take the core, drilling appropriate drilling tools (especially with pump-free drilling and drilling Drilling must rhythmically move the drill away from the bottom of the hole) also rely on drill pipe;