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A manufacturing process of large-diameter thick-walled high-strength welded pipe

A manufacturing process and large-diameter technology, applied in the field of welded pipe manufacturing, can solve problems such as the inability to effectively guarantee the quality of the weld, affect the dimensional accuracy of the pipe, and the large amount of welding groove processing, so as to achieve good promotion and application value, improve production efficiency, Effect of reducing welding cost

Active Publication Date: 2019-08-23
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main difficulty of using welded pipes to manufacture thick-walled steel pipes with a diameter-to-thickness ratio of less than 20 is: if high-frequency welding is used, the pipe diameter and thickness are limited, and the general thickness is ≤20mm; A lot of welding consumables are consumed, and the welding deformation is large, which directly affects the dimensional accuracy of the pipe. Due to the multi-layer and multi-pass welding, the probability of welding defects is high, and the quality of the weld cannot be effectively guaranteed

Method used

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  • A manufacturing process of large-diameter thick-walled high-strength welded pipe
  • A manufacturing process of large-diameter thick-walled high-strength welded pipe
  • A manufacturing process of large-diameter thick-walled high-strength welded pipe

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Effect test

Embodiment 1

[0029] A large-diameter thick-walled high-strength welded pipe adopts hot-rolled steel plates with a yield strength of 750MPa, a tensile strength of 890MPa, and a thickness of 14mm. The specifications of the welded pipe are: diameter 273mm, wall thickness 14mm. The specific steps of its manufacturing process are as follows:

[0030] (1) The edge of the high-quality hot-rolled steel plate is processed into a Y-shaped welding groove, the groove angle is 50°, and the length of the blunt edge is 10mm;

[0031] (2) Perform flaw detection on the plate body obtained in step (1) without defects, and after forming (the steel plate is formed into a pipe body after being pressed into an O shape), perform high-frequency welding on the blunt edge of the Y-shaped welding groove, and the welding frequency is 150KHz , the welding speed is 20m / min, the welding thickness is 10mm, and the internal burrs are removed after welding;

[0032] Then perform submerged arc welding on the groove of the Y...

Embodiment 2

[0037] A large-diameter thick-walled high-strength welded pipe adopts hot-rolled steel plates with a yield strength of 235MPa, a tensile strength of 480MPa, and a thickness of 40mm. The specifications of the welded pipe are: diameter 660mm, wall thickness 40mm. The specific steps of its manufacturing process are as follows:

[0038] (1) The edge of the high-quality hot-rolled steel plate is processed into a Y-shaped welding groove, the groove angle is 60°, and the length of the blunt edge is 20mm;

[0039] (2) Perform flaw detection on the plate body obtained in step (1) without defects. After forming, carry out high-frequency welding on the blunt edge of the Y-shaped welding groove. The welding frequency is 100KHz, the welding speed is 14m / min, and the welding thickness is 20mm. Remove internal burrs;

[0040] Then, carry out submerged arc welding on the groove of the Y-shaped welding groove, select 500Mpa solid core submerged arc welding wire to match SJ101 flux, 3 wire subm...

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Abstract

The invention discloses a manufacturing process for a large-diameter thick-wall high-strength welded tube. A high-quality hot-rolled steel plate is adopted as a tube manufacturing raw material. The manufacturing process includes the main steps of plate edge groove machining, forming, high-frequency welding, internal burr removing, submerged arc welding, on-line heat treatment of weld joints, diameter-fixing finishing, straightening, and mark spraying and warehousing. A plate edge groove is a Y-shaped welding groove with the groove angle of 50-60 degrees, and the length range of the blunted edge is 10-20 mm. By means of the adopted technical scheme, a seamless tube is replaced with the large-diameter thick-plate welded tube, and the maximum wall thickness can reach 40 mm; the weldable thickness is increased in the technical scheme compared with singular high-frequency welding, removing of outer burrs generated in high-frequency welding is omitted, and the tube manufacturing procedure is accelerated; and welding workload is lowered compared with singular submerged arc welding, welding efficiency is improved, welding material consumption is reduced, and the welding cost is reduced.

Description

technical field [0001] The technical solution relates to the technical field of welded pipe manufacturing, in particular to a manufacturing process of a large-diameter thick-walled high-strength welded pipe. Background technique [0002] Thick-walled steel pipes are also called thick-walled steel pipes. Steel pipes with a ratio of outer diameter to wall thickness of less than 20 are called thick-walled steel pipes. They are mainly used as structural pipes such as petroleum geological drilling pipes and construction steel structures. At present, large-diameter thick-walled steel pipes at home and abroad are mostly made of steel ingots or solid tube blanks through perforation to make capillaries, and then made by hot rolling, cold rolling or cold drawing. Welded pipes mainly produce thin-walled pipes, while seamless pipes have certain requirements for wall thickness. Short, high production efficiency, wide range of specifications, energy saving, low production cost, and high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 陈浮刘占增骆海贺钟如涛
Owner 武汉钢铁有限公司
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