采用光学显微镜、扫描电子显微镜（SEM）、显微维氏硬度计等仪器对某摩擦焊钻杆生产检测过程中发现的焊缝异常组织进行了分析。结果表明:钻杆焊缝处的异常组织为马氏体、铁素体和屈氏体，该异常组织是因为回火温度偏高，超过接头的Ac1温度，导致部分组织奥氏体化造成的; 由于该类异常组织脆性较大、对钻井液中的腐蚀介质敏感性较高，因此会大大缩短钻杆的使用寿命。建议加强现场操作规范化，避免该类异常组织的出现。

The abnormal microstructure of drill pipe weld found in the process of production inspection was analyzed by apparatuses of optical microscope, scanning electron microscope and micro Vicker hardness tester. The results show that the abnormal microstructure of drill pipe weld consisted of martensite, ferrite and troostite. It was because the tempering temperature was high and exceeded the Ac1 temperature of the joint, which resulted in partial austenitizing of the microstructure. Because the brittleness and sensitivity to erosion medium in the drilling fluid of the abnormal microstructure were rather high, it would greatly shorten the service life of the drill pipe. Strengthening the standardized operation was suggested to avoid reoccurrence of the abnormal microstructure.