To achieve higher quality and higher performance of a welded joint part from the laminated structure of the welded joint part and also to propose a longitudinal seam welded joint which is efficient in the execution of welding and excellent in economical efficiency, in the longitudinal seam welded joint of a UOE steel pipe.
The longitudinal seam welded joint of the UOE steel pipe is formed by butting the both end parts of a steel plate on which a grooving processing is performed and joining them by a seam welding. By taking the groove as a double V groove, the root face part 5 of the groove in the middle part of the thickness is joined by deep penetration welding and the groove parts 3, 4 are joined on both sides in the thickness direction by flush welding respectively, and the welded joint having a cross-sectional shape of three-layer laminating structure is made.
| JP5978107 | A tubulation device and the tubulation method using it |
| JPS58179928 | 【考案の名称】鋼板端面矯正機 |
KAWABATA FUMIMARU
Yoshiaki Naito
Cui Shu Tetsu
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