According to the characteristics of drill collars, welding control device and special welding gun are designed, welding groove and shielding gas and welding technology ale determined, and welding technological parameters are optimized. 研究中针对钻铤这种小直径厚壁管的特点研制了焊接控制设备、专用焊枪,设计焊接坡口,精选保护气体,确定焊接工艺,优选焊接工艺参数。