apparatus and method for x-ray examination of the area of the welding line of a side of a steel tube uk double.

摘要

A device for radiographically inspecting the girth weld seam on a double-jointed pipe (D) includes a cart (W) on which the pipe is mounted, for transporting the pipe longitudinally to a location where it surrounds a radiation source (14) mounted on one end of a cantilevered boom (B). A radiation detection unit (C) that produces a visible image of radiation penetrating through the pipe is disposed on the outside of the pipe in alignment with the radiation source. When the girth weld on the pipe is brought into registry with the radiation source by the cart, rollers (19) on the cart are actuated to rotate the pipe about its longitudinal axis, thereby enabling the entire periphery of the girth weld to be inspected. The video image of the girth weld can be observed on a video monitor (32), and recorded by means of a video cassette recorder (33) and a facsimile unit (37). Appropriate instructions relating to repairs to be performed on the pipe can also be included in the recordings. A spray marker (27) located adjacent the radiation detection unit enables an operator to precisely mark the locatiion of detected flaws on the pipe, to facilitate subsequent repairs in accordance with the instructions on the recorded medium.