The common methods of drillingrods testing include magnetic particle inspection, permeability testing, radial testing and ultrasonic testing, but these methods all have considerable deficiencies.
检测钻具缺陷的常用方法有磁粉探伤、渗透检测、射线检测、超声波检测,都存在不足。
2
After pumping the tube down the rodsdrilling can recommence.
将管子压下去后,可以重新开始钻井。
3
The structural characters of steel pipe drilling rod, the signification of welding repair for the rods and the narrow gap welding process and equipment are introduced in the paper.