X射线管道爬行器在长输管道环焊缝射线检测中得到越来越广泛的应用。其在西气东输二线大口径长输管道的应用中，出现周向锥靶X射线发生器偏靶现象，致使周向X射线场强不均匀，拍摄的底片黑度差异大。对此提出了将聚焦线圈应用在周向锥靶X射线发生器中，以纠正电子束轨迹的方法。通过分析，试验达到了周向上场强均匀的目的。在后续的长输管道射线检测应用施工中收到良好效果。

X ray crawler in long distance pipeline girth welding seam X-ray detection is widely used. During the application in the second west to East Gas Pipeline Project of large diameter pipeline, partial target phenomenon was observed for circumferential conical target X ray generator, causing the circumferential X ray intensity inhomogeneity and film densiting difference. To solve this problem, the focusing coil was used in the circumferential conical target X ray generator to correct the trajectory ofelectron beam. Through the analysis of the experiment, circumferential field intensity reached the purpose of uniform. Application in the follow-up of the long distance pipeline construction in radiographic testing received good results.