公开(公告)号：US5019189A

公开(公告)日：1991-05-28

申请号：US506472

申请日：1990-04-09

Applicant: Mitsuo Kumura ,  Tatsufumi Uegaki

Inventor： Mitsuo Kumura ,  Tatsufumi Uegaki

IPC: B23K35/30

CPC classification number: B23K35/3053 ,  Y10T428/12292

Abstract: A pipeline and steel pipe having superior resistance to carbon dioxide corrosion and suitable for transporting crude oil, natural gas and the like containing carbon dioxide. The pipeline includes in combination, pipe sections including a base metal having a composition containing not more than 0.25 wt % of C, from 0.01 to 0.50 wt % of Si; from 0.1 to 2.0 wt % of Mn; not more than 0.03 wt % of P; not more than 0.01 wt % of S; from 0.25 to 1.0 wt % of Cr; from 0.01 to 0.10 wt % of Al, and the balance substantially Fe and inevitable impurities, and a weld metal connecting the pipe sections together having a Cr content ranging from a value which is 0.2 wt % smaller than the Cr content of the base metal and a value which is 1.0 wt % greater than the Cr content of the base metal.The method of the invention includes circumferential welding for connecting steel pipes together by gas-metal arc welding using a welding wire containing Cr and Ti in such amounts as to meet the condition of: Cr wt % +3.times.Ti wt % .ltoreq.2.4 wt % wherein , Cr wt % and Ti wt % respectively represent the contents of Cr and Ti of the welding wire in wt %.

公开(公告)号：US4527033A

公开(公告)日：1985-07-02

申请号：US496840

申请日：1983-05-23

Applicant: Junya Matsuyama ,  Akio Kamada ,  Fumimaru Kawabata ,  Tatsufumi Uegaki ,  Shigeru Miyake

Inventor： Junya Matsuyama ,  Akio Kamada ,  Fumimaru Kawabata ,  Tatsufumi Uegaki ,  Shigeru Miyake

IPC: B23K31/00 ,  B23K9/025 ,  C21D9/50 ,  B23K9/02

CPC classification number: B23K9/0253 ,  C21D9/50

Abstract: An improved welding method for welding an inner seam of a longitudinally welded steel pipe along an inner groove by welding electrodes held by a boom which is supported by a tracing roller moving along the inner groove of the steel pipe. According to the invention, at least one metal plate is urged against at least one end of the steel pipe after tack welding the seam on an opposite side of the inner groove of the steel pipe to be welded. Lateral angular deformations of the end of the steel pipe are prevented on both sides of the seam. Such deformations are due to the load of the boom when the tracing roller leaves the end of the steel pipe for the metal plate. Thus, the invention provides for prevention of hot cracking at the end of the pipe. Moreover, according to the invention, portions of the steel pipe on both sides of the distal end of the weld bead, at the end of the pipe, are heated to cause expansion displacements of the heated portions directing toward the center of the weld bead, or high temperature portions of the steel pipe, after a heat source for the seam welding has passed therethrough, are cooled, thereby reducing tearing forces acting upon the weld bead so as to prevent more effectively the hot cracking at the end of the pipe.

Abstract translation: 一种改进的焊接方法，用于通过由沿着钢管的内槽移动的跟踪辊支撑的由悬臂保持的焊接电极焊接沿着内槽的纵向焊接钢管的内缝。 根据本发明，在将要焊接的钢管的内槽的相对侧上定位焊接之后，至少一个金属板被推靠在钢管的至少一端。 在接缝的两侧都防止了钢管端部的横向角变形。 这种变形是由于当跟踪辊离开用于金属板的钢管的端部时起重臂的负载。 因此，本发明提供了防止管道末端的热裂纹。 此外，根据本发明，焊管末端在管末端处的钢管的两侧的部分被加热，从而引起朝向焊道中心的加热部分的膨胀位移， 或者在用于缝焊的热源通过其后的钢管的高温部分被冷却，从而减少作用在焊道上的撕裂力，从而更有效地防止管道末端的热裂纹。