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Production method for large-diameter thick-wall steel pipe

A production method and large-diameter technology, applied in the production of large-diameter thick-walled steel pipes, can solve problems such as repair difficulties, achieve the effects of improving welding quality, ensuring performance, and reducing temperature rise speed and temperature rise

Inactive Publication Date: 2021-07-09
浙江科鑫重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the defect that the existing large-diameter thick-walled spiral welded pipe adopts one-time welding and is relatively difficult to repair, and provides a production method of large-diameter thick-walled steel pipe, which can be welded twice to reduce the difficulty of repairing

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  • Production method for large-diameter thick-wall steel pipe
  • Production method for large-diameter thick-wall steel pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , a production method of a large-diameter thick-walled steel pipe according to Embodiment 1 of the present invention, the production method comprising the following steps:

[0037] S1, unwinding, leveling and pre-bending the steel coil to form a spiral steel strip;

[0038] S2, performing positioning pre-welding on the spiral steel strip;

[0039] S3, diameter measurement;

[0040] S4. Precisely weld the spiral steel strip after positioning and pre-welding;

[0041] S5, pipe cutting, slag cleaning;

[0042] Among them, the weld seam strength after positioning pre-welding is smaller than that of precise welding.

Embodiment 2

[0044] see figure 2 , the second large-diameter thick-walled steel pipe production method of the embodiment of the present invention, the production method includes the following steps:

[0045] S1, unwinding, leveling and pre-bending the steel coil to form a spiral steel strip;

[0046] S2, performing positioning pre-welding on the spiral steel strip;

[0047] S3, diameter measurement;

[0048] S4. Precisely weld the spiral steel strip after positioning and pre-welding;

[0049] S5, pipe cutting, slag cleaning;

[0050] Among them, the weld seam strength after positioning pre-welding is smaller than that of precise welding.

[0051] As an improvement, if the diameter measurement of step S3 is passed, then the precise welding of S4 is directly carried out; if the diameter measurement of step S3 is not passed, then the spiral steel strip is cut to perform positioning pre-welding again.

[0052] As an improvement, the cutting of the spiral steel strip is completed by the r...

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Abstract

The invention belongs to the technical field of steel pipe production equipment, and particularly relates to a production method for a large-diameter thick-wall steel pipe. The production method aims at solving the problem that an existing large-diameter thick-wall spiral welded pipe is formed through one-time welding and is difficult to repair. According to the technical scheme, the production method for the large-diameter thick-wall steel pipe comprises the following steps of: performing positioning pre-welding on a spiral steel belt; measuring the diameter; and performing accurate welding on the spiral steel belt obtained after positioning pre-welding; wherein the welding seam strength after positioning pre-welding is smaller than the welding seam strength after accurate welding. The production method for the large-diameter thick-wall steel pipe has the beneficial effects that second-time welding mode of positioning pre-welding and accurate welding is adopted, diameter measurement is performed after positioning pre-welding, and repairing is facilitated when the steel pipe is unqualified; and positioning pre-welding has a preheating effect, steel pipe temperature rise speed and temperature rise amount are reduced, the welding quality is improved, and the steel pipe performance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of steel pipe production equipment, and in particular relates to a production method of large-caliber thick-walled steel pipes. Background technique [0002] At present, large-diameter thick-walled spiral welded pipes are widely used in the fields of steel pipe pile engineering, fluid conveying pipelines, and steel structures. It is crimped and welded to produce a spiral steel pipe with a helical weld and a butt weld (the welding seam of the previous steel strip tail and the rear steel strip head). Among them, the spiral weld is generally welded by double-sided automatic submerged arc welding, and the front of the butt weld (that is, the inner side of the spiral welded pipe) is generally welded by automatic submerged arc welding. [0003] The current spiral welded pipe production process is directly welded to form a spiral weld. However, during production, it was found that when the spiral weld seam is for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 吴欣航徐旭锋任立纯陈静朴泷魏军张兴志桑巍张明徐亮
Owner 浙江科鑫重工有限公司
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