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Laser-MAG composite welding method of high-steel-grade pipeline steel

A composite welding and pipeline steel technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of increased production cost, waste, and high degree of weld alloying, so as to improve the strength of weld seam and reduce the use of alloy Amount, grain refinement effect of weld structure

Inactive Publication Date: 2019-03-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201710511788 discloses a laser-MAG composite welding method for pipeline steel. Although the welding efficiency is improved, the filler wire still chooses equal-strength wire with similar composition to the base metal, and the alloying degree of the obtained weld is still high. Increased production costs, resulting in unnecessary waste

Method used

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  • Laser-MAG composite welding method of high-steel-grade pipeline steel
  • Laser-MAG composite welding method of high-steel-grade pipeline steel
  • Laser-MAG composite welding method of high-steel-grade pipeline steel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A laser-MAG composite welding method for high-grade pipeline steel, comprising the following steps:

[0026] Step (1), select welding wire;

[0027] Step (2), removing oil stains on the surface of the high-grade pipeline steel plate;

[0028] Step (3), placing the high-grade pipeline steel plate after oil removal on the workbench and fixing it with a welding fixture;

[0029] Step (4), performing laser-MAG composite welding on high-grade pipeline steel plates,

[0030] The strength level of the welding wire is lower than that of the high-grade pipeline steel plate.

[0031] In this example, the thickness of the two high-grade pipeline steel plates is 7mm, the model is X100, and the strength grade is 700MPa. The structure of the high-grade pipeline steel plate is granular bainite. The composition of the high-grade pipeline steel is shown in Table 1. ; Carry out single-pass laser-MAG composite welding; the welding wire is 500MPa-grade welding wire, the type of welding ...

Embodiment 2

[0038] A laser-MAG composite welding method for high-grade pipeline steel, comprising the following steps:

[0039] Step (1), select welding wire;

[0040] Step (2), removing oil stains on the surface of the high-grade pipeline steel plate;

[0041] Step (3), placing the high-grade pipeline steel plate after oil removal on the workbench and fixing it with a welding fixture;

[0042] Step (4), performing laser-MAG composite welding on high-grade pipeline steel plates,

[0043] The strength level of the welding wire is lower than that of the high-grade pipeline steel plate.

[0044] In this example, the average thickness of two high-grade pipeline steel plates is 7mm, the model is X100, and the strength grade is 700MPa. The structure of high-grade pipeline steel plates is granular bainite. The composition of high-grade pipeline steel is shown in Table 1; Perform single-pass laser-MAG composite welding; the welding wire is 500MPa-grade welding wire, the type of welding wire is...

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Abstract

The invention relates to a laser-MAG composite welding method of high-steel-grade pipeline steel, and belongs to the technical field of welding of the high-steel-grade pipeline steel. The laser-MAG composite welding method of the high-steel-level pipeline steel comprises the following steps that (1) a welding wire is selected; (2), oil stains on the surface of the high-steel-grade pipeline steel plate is removed; (3), the high-steel-grade pipeline steel plate with the oil stain removed is placed on a workbench and fixed by a welding clamp; (4), the high-steel-grade pipeline steel plate is subjected to the laser-MAG composite welding, wherein the strength level of the welding wire is lower than that of the high-steel-grade pipeline steel plate. The laser-MAG composite welding method of thehigh-steel-grade pipeline steel is provided, the mechanical property of a high-steel-grade pipeline steel welding joint can be improved, so that the strength of the welding joint can reache the strength level of a base material, and the alloying degree and the production cost of the welding joint can be reduced.

Description

technical field [0001] The invention relates to the technical field of high-grade pipeline steel welding, in particular to a laser-MAG composite welding method for high-grade pipeline steel. Background technique [0002] With the development of the national economy, the gradual increase in the amount of oil and gas used by people has prompted the development of oil and gas transportation pipelines to large-diameter, high-pressure, and long-distance. In the process of pipeline forming and laying, the quality of pipeline steel welded joints determines the safety and service life of transportation pipelines. At present, the main welding methods used in domestic pipeline steel are electrode manual welding, gas metal shielded welding, submerged arc welding and other methods. The above methods cannot meet the high mechanical requirements due to the serious softening problem of the welded joints obtained by the heat input. performance requirements. In order to make the strength o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 邸洪双齐霄楠王晓南高源龚夕淮
Owner NORTHEASTERN UNIV LIAONING