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Welding wire for gas shielded welding for high-strength pipe line steel

A high-strength pipeline steel, gas shielding technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem that the strength and toughness matching of welding wires and the welding process performance are difficult to meet the welding technical requirements of X80 grade pipeline steel. , to achieve the effect of good welding processability, high strength and good low temperature impact toughness

Active Publication Date: 2014-09-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing gas shielded welding wire strength and toughness matching and welding process performance can hardly meet the welding technical requirements of X80 pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. The chemical composition Wt% of the welding wire is (the balance is Fe):

[0022] Element

C

mn

Si

S

P

Ni

Ti

content

0.065

1.92

0.83

0.0041

0.008

1.12

0.05

[0023] 2. Welding process: welding shielding gas is argon-rich mixed gas 80% Ar+20% CO 2 . The welding current is 270A, the welding voltage is 29V, the welding speed is 30cm / min, and the gas flow rate is 20L / min. A total of six layers of deposited metal are welded, with 8 to 10 passes in each layer. The welding heat energy of the bottom welding is 16KJ / cm, the welding heat energy of the filling welding is 13.5KJ / cm, and the interlayer temperature is kept at about 150°C.

[0024] According to the test, the welding wire has good process performance, stable welding arc, small spatter, suitable for all-position welding, beautiful weld bead shape, and no welding defects such as pores, slag inclusions, and lack of fusi...

Embodiment 2

[0028] 1. The chemical composition Wt% of the welding wire is (the balance is Fe):

[0029] Element

C

mn

Si

S

P

Ni

Ti

content

0.071

1.88

0.98

0.0036

0.0075

0.82

0.085

[0030] 2. Welding process: welding shielding gas is argon-rich mixed gas 80% Ar+20% CO 2 . The welding current is 270A, the welding voltage is 29V, the welding speed is 30cm / min, the gas flow rate is 20L / min, the deposited metal is welded in six layers, each layer has 8 to 10 passes, and the welding line energy of the root welding is 16KJ / cm , The welding line energy of the filling welding is 13.5KJ / cm, and the interlayer temperature is kept at about 150°C.

[0031] According to the test, the welding wire has good process performance, stable welding arc, small spatter, suitable for all-position welding, beautiful weld bead shape, and no welding defects such as pores, slag inclusions, and lack of fusion in the w...

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PUM

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Abstract

The invention discloses a welding wire for gas shielded welding for high-intensity pipe line steel, which comprises the following components in percentage by weight: 0.05-0.08% of C, 0.7-1.2% of Si, 1.8-2.5% of Mn, less than 0.010% of P, less than 0.005% of S, 0.7-1.2% of Ni, 0.04-0.1% of Ti and the balance of Fe. In the invention, through determining the reasonable component ranges of the elements C, Mn, Si, Ni and Ti, when the X80 pipe line steel is welded, the weld metal has high intensity and relatively high low temperature impact toughness, and the welding wire has excellent technological properties and favorable adaptability. The welding wire is suitable for the welding of all positions of the X80 grade pipe line steel and particularly suitable for the circumferential weld welding of the X80 grade pipe line steel. The welding wire is completely suitable for the field welding of the X80 grade pipe line steel for a high pressure oil and gas conveying pipeline.

Description

technical field [0001] The invention relates to a gas-shielded welding wire for high-strength pipeline steel, which is suitable for all-position welding of X80-grade pipeline steel, and is particularly suitable for welding the girth weld of X80-grade pipeline steel. Background technique [0002] X80-grade steel pipes for natural gas transmission pipelines have high strength, large pipe diameters, thick pipe walls, and long distances, which greatly increase the labor intensity of on-site welding construction. Especially for pipeline construction in areas with harsh climate and geographical environment, the effective construction time is short. In this case, promoting the use of automatic welding technology can reduce labor intensity, improve construction efficiency, and shorten construction period. [0003] X80 grade pipeline steel has high requirements on welding process performance, weld mechanical properties and production technology of welding wire, especially on-site gi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
Inventor 杨忠文毕宗岳刘海璋牛辉张锦刚王建赵红波牛爱军
Owner BC P INC CHINA NAT PETROLEUM CORP