Patent ID: 11859748
Assignee: NIPPON STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F  G | IPC B  F

Claim 0:
1. A joint connection method for a long pipe for connecting a first joint and a second joint to a front end portion and rear end portion of the long pipe, respectively, by using a production facility which comprises: a conveyance system which conveys a pipe in a longitudinal direction; a welding apparatus which is disposed along the conveyance system and which performs girth welding that welds together end portions of a plurality of pipes conveyed by the conveyance system to form a long pipe; a winding apparatus which is disposed along the conveyance system and which winds the long pipe that is conveyed by the conveyance system around a reel; and an X-ray inspection apparatus which is disposed between the welding apparatus and the winding apparatus along the conveyance system and which inspects a girth weld zone of the long pipe;
the joint connection method comprising:
a first joint girth welding step of girth welding the first joint to a front end portion of the long pipe by means of the welding apparatus,
a first girth weld zone inspection step of inspecting a girth weld zone of the first joint by means of the X-ray inspection apparatus,
a second joint girth welding step of girth welding the second joint to a rear end portion of the long pipe by means of the welding apparatus, and
a second girth weld zone inspection step of inspecting a girth weld zone of the second joint by means of the X-ray inspection apparatus.