过去 ,无论是进口还是国产射线管道爬行器 ,在检测变壁厚管道时都是先将曝光时间调到一种壁厚所需要的曝光时间值 ,爬行器进入管道对这种壁厚的焊缝透照 ,然后退出管道 ,操作人员再将定时时间调到另一壁厚所需的曝光时间 ,爬行器再次进入管道 ,拍照另一种壁厚的焊缝 ,对于距离 In the past, whether it is imported or domestic ray tube crawler, the detection of variable wall thickness of the pipeline are the first time the exposure time adjusted to a wall thickness required exposure time value, the crawler into the pipeline on the thickness of the weld Transillumination, and then exit the pipe, the operator and then set the timing time required to adjust the exposure time of another wall thickness, the crawler re-enter the pipeline, taking pictures of another kind of wall thickness of the weld, for the distance