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Welded pipe and manufacturing method thereof

A manufacturing method and technology for welded pipes, which are applied to manufacturing tools, welding equipment, tubular objects, etc., can solve the problems of difficulty in greatly improving welding efficiency, poor welding quality, and large amount of metal filling, so as to improve welding production efficiency and reduce welding times. , the effect of saving welding consumables

Active Publication Date: 2014-02-05
番禺珠江钢管(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to deficiencies such as repeated welding and large amount of metal filling, it is difficult to greatly improve the welding efficiency, and the welding quality is poor, and defects such as pores and slag inclusions are prone to occur. If the temperature control is not good, cracks may even appear

Method used

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  • Welded pipe and manufacturing method thereof
  • Welded pipe and manufacturing method thereof
  • Welded pipe and manufacturing method thereof

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Embodiment Construction

[0026] Embodiments of the present invention are described in detail below in conjunction with accompanying drawings:

[0027] Such as figure 1 Shown, a kind of welded pipe manufacturing method comprises the steps:

[0028] S110: pre-processing the grooves of the two areas to be welded of the welded pipe, the grooves include a first chamfer, a second chamfer, and a blunt edge connecting the first chamfer and the second chamfer;

[0029] S120: Position and join the welded pipe. After joining, the blunt edges of the two grooves coincide, so that the first chamfers of the two grooves are connected to form the first notch, and the second chamfers of the two grooves are connected. connecting to form a second notch;

[0030] S130: Welding the blunt edge by laser welding until close to penetration;

[0031] S140: Perform single-pass filling and cover welding on the first notch and the second notch respectively by submerged arc welding.

[0032] The manufacturing method of the weld...

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Abstract

The invention discloses a welded pipe manufacturing method which includes preprocessing two grooves of an area to be welded of a welded pipe with each groove comprising a first chamfer portion, a second chamfer portion and a truncated edge portion connected with the first chamfering portion and the second chamfering portion; conducting location seam closure on the welding pipe, enabling the truncated edge portions of the two grooves to coincide after the seam closure, and enabling the first chamfer portions of the two grooves to be connected to form a first groove opening and the second chamfer portions of the two grooves to be connected to form a second groove opening; welding the truncated edge portions through laser welding till the truncated edge portions are almost subjected to weld penetration; conducting single-run filling cosmetic welding on the first groove opening and the second groove opening through submerged-arc welding. According to the welded pipe manufacturing method, butt connection of the truncated edge portions of the grooves in the middle of a welding seam is achieved through laser welding, then the submerged-arc welding is utilized to achieve single-run welding, welding times are reduced, preheating and heat insulation are not required, welding production efficiency can be greatly improved, post-welding surplus seam height and lossless yield of the welding seam are higher than those in the prior art, and the performances of the welding seam such as strength, toughness and bending performance are better than those in the prior art.

Description

technical field [0001] The invention relates to the technical field of welded steel pipe production, in particular to a welded pipe and a manufacturing method thereof. Background technique [0002] Welded pipe refers to welded steel pipe, which is a steel pipe made of steel plate or strip steel after crimping and welding. After the steel plate is curled and formed, two adjacent plate edges are welded to form a welded pipe. The wall thickness of the welded pipe is generally 6mm-70mm, and the length is generally 3m-12m. Usually, the wall thickness is 30mm-70mm and belongs to the thick-walled welded pipe. [0003] The traditional thick-walled welded pipe manufacturing method is to process the area of ​​the welded pipe to be welded into an "X"-shaped groove, and then perform multi-layer and multi-channel automatic submerged arc welding on the groove. In order to ensure the weld seam quality of thick-walled welded pipes, especially to resist hydrogen-induced cracks, the shape of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K33/00
CPCB23K26/348B23K33/00B23K2101/06B23K2103/04
Inventor 苏镜洪黄克坚苏章卓莫敏玲胡晨
Owner 番禺珠江钢管(珠海)有限公司
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