在射线底片扫描前，须在环焊缝位置以圆圈标识出与前管螺旋焊缝和后管螺旋焊

Before scanning the radiographic film, the two positions that intersect the spiral weld of the front tube and the spiral weld of the rear tube must be marked with a circle at the position of the circumferential weld, so that the consistency of the welding port and the radiographic film can be checked in the next step.

Before the ray negative scan, the ring weld position sits circled to identify the two positions that intersect the front tube helix weld and the rear tube screw weld for the next step of verification of the consistency of the weld and ray negatives.

Before the X-ray film scanning, two positions intersecting the front pipe spiral weld and the rear pipe spiral weld must be marked with a circle at the circumferential weld position, so as to facilitate the next step to check the consistency of the weld joint and the radiograph.