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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  • Abstract
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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

Method used

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  • Submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and surface protection method thereof
  • Submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and surface protection method thereof
  • Submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and surface protection method thereof

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Embodiment Construction

[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 fi

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Abstract

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

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Claims

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Application Information

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Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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