Submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and surface protection method thereof
A straight seam welded pipe and outer sector technology, which is applied in metal material coating process, fusion spraying, coating and other directions, can solve the problems that the outer sector is not easy to replace, affect the quality of the steel pipe, and wear the outer sector, so as to improve the service life. , The effect of convenient milling processing and quality improvement
Inactive Publication Date: 2015-05-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0004] In order to solve the problems that the outer sector block is easy to wear when the diameter of the straight seam welded pipe is enlarged, the extrusion of the outer sector block on the weld area affects the quality of the steel pipe, and the outer sector block is processed in one piece and is not easy to replace, the present invention provides an improved Expanded outer sector of submerged arc welded straight seam welded pipe for deep sea
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[0026] In order to describe the present invention more clearly and completely, the present invention will be described below in conjunction with specific examples and accompanying drawings.
[0027] A U-shaped weld seam accommodation groove is provided outside the fan-shaped middle part of the outer fan-shaped block 1 of the submerged arc welding straight seam welded pipe for deep sea use. The second arc portion 3 and the third arc portion 4 at the bottom form a ternary boride cermet coating 5 on the outer surface of the outer sector block. Preferably, the length of the third arc portion 4 at the bottom of the U-shaped weld receiving groove is 38 mm to 48 mm, and the length of the first arc portion 2 and the second arc portion 3 on both sides is 4.8 mm to 5.9 mm. The included angles between the first arc portion 2 and the third arc portion 4 and between the second arc portion 3 and the third arc portion 4 are all 130° to 140°. The outer sector block is radially divided into a...
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The invention relates to steel tube expanding head diameter expansion outer fan-shaped blocks, in particular to a submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and a surface protection method thereof. A U-shaped welded joint containing groove is formed in the outer side of the fan-shaped middle part of the submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea. The U-shaped welded joint containing groove comprises a first arc-shaped part on the left side, a second arc-shaped part on the right side and a third arc-shaped part at the bottom. A ternary boride metal ceramic coating is formed on the outer surface of the outer fan-shaped block. The surface protection method of the outer fan-shaped block includes the steps that the U-shaped welded joint containing groove is formed in the outer fan-shaped block, then plasma spraying machining is conducted on the outer surface of the outer fan-shaped block through plasma spraying equipment and an automatic synchronization powder feeding device, and the ternary boride metal ceramic coating is formed. According to the submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea, the service life of an expanding head can be effectively prolonged, the replacement cost of the expanding head is lowered, and the quality of the inner wall of a welded pipe is improved.
Description
technical field [0001] The invention relates to a diameter-expanding outer sector block for a steel pipe expansion head, in particular to a deep-sea submerged arc welding straight seam welded pipe diameter-expanding outer sector block and a surface protection method thereof. Background technique [0002] Longitudinal welded pipe diameter expansion is the last main process of longitudinal welded pipe JCO forming, and it is also a key process to obtain the final size and precision. In the production of welded pipes, expanding its diameter can eliminate deformation, improve precision, improve steel pipe straightness, increase yield strength and reduce residual stress. When the diameter is expanded, the expansion rod moves to the right, driving the inner cone to move to the right, forcing the circumference of the outer fan-shaped block to increase, and the force of the inner cone acts on the steel pipe with the help of the outer fan-shaped block ring, so that The diameter of th...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21D39/20C23C4/12C23C4/10C23C4/06C23C4/131C23C4/134
CPCB21D39/20C23C4/10C23C4/12
Inventor 姚正军周艳军罗西希林玉划姚一波张泽磊徐尚君
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS