Metal powder-cored wire for welding X80 high-strength low-alloy pipeline steel

A low-alloy, high-strength, metal powder core technology, applied in welding media, welding equipment, welding equipment, etc., can solve the problems of low production efficiency of low-hydrogen electrodes, unfused solid welding wire, low diffusible hydrogen content, etc., and achieve good The effect of welding operation process performance, reduction of welding defects, low content of diffusible hydrogen

Active Publication Date: 2015-01-07
TIANJIN YONGCHANG WELDING WIRES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-hydrogen electrodes and solid wires have low diffusible hydrogen content to meet the requirements, but the production efficiency of low-hydrogen electrodes is low, and solid wires are prone to defects such as unfusion and false fusion

Method used

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  • Metal powder-cored wire for welding X80 high-strength low-alloy pipeline steel
  • Metal powder-cored wire for welding X80 high-strength low-alloy pipeline steel
  • Metal powder-cored wire for welding X80 high-strength low-alloy pipeline steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The weight percent of each component in the metal powder core is: 8% low-carbon ferromanganese, 5% ferrosilicon, 1% ferrotitanium, 8% nickel powder, 1% ferromolybdenum, 4% ferroboron, 2% magnesium powder , rare earth fluoride 1%, iron powder 70%.

[0031] The mass of the metal powder core accounts for 12% of the total mass of the welding wire.

[0032] Metal powder cored flux cored wire welding conditions: the shielding gas is a mixed gas with a volume content of 80% Ar 2 and 20% CO 2 , current 260A, voltage 28V.

[0033] Metal powder cored flux cored wire deposited metal composition detection, its weight percentage is: carbon 0.035%, manganese 0.71%, silicon 0.16%, sulfur 0.007%, phosphorus 0.008%, nickel 0.81%, molybdenum 0.065, titanium 0.017, boron 0.015, The balance is iron.

[0034] Metal powder cored flux cored wire deposited metal mechanical properties:

[0035]

[0036] Metal powder cored flux cored wire deposited metal diffusible hydrogen content: 3.8m...

Embodiment 2

[0038] The weight percent of each component in the metal powder core is: 15% low-carbon ferromanganese, 9% ferrosilicon, 3% ferrotitanium, 12% nickel powder, 3% ferromolybdenum, 8% ferroboron, 5% magnesium powder , rare earth fluoride 4%, iron powder 41%.

[0039] The mass of the metal powder core accounts for 17% of the total mass of the welding wire.

[0040] Metal powder cored flux cored wire welding conditions: the shielding gas is a mixed gas with a volume content of 80% Ar 2 and 20% CO 2 , current 260A, voltage 28V.

[0041] Metal powder cored flux cored wire deposited metal composition detection, its weight percentage is: carbon 0.058%, manganese 1.31%, silicon 0.34%, sulfur 0.004%, phosphorus 0.007%, nickel 1.05%, molybdenum 0.15, titanium 0.050, boron 0.035, The balance is iron.

[0042] Metal powder cored flux cored wire deposited metal mechanical properties:

[0043]

[0044] Metal powder cored flux cored wire deposited metal diffusible hydrogen content: 3.5...

Embodiment 3

[0046] The weight percent of each component in the metal powder core is: 11.5% of low-carbon ferromanganese, 7% of ferrosilicon, 2% of ferrotitanium, 10% of nickel powder, 2% of ferromolybdenum, 6% of ferroboron, and 3.5% of magnesium powder , rare earth fluoride 2.5%, iron powder 55.5%.

[0047] The mass of the metal powder core accounts for 14.5% of the total mass of the welding wire.

[0048] Metal powder cored flux cored wire welding conditions: the shielding gas is a mixed gas with a volume content of 80% Ar 2 and 20% CO 2 , current 260A, voltage 28V.

[0049] Metal powder cored flux cored wire deposited metal composition detection, its weight percentage is: carbon 0.045%, manganese 1.02%, silicon 0.25%, sulfur 0.007%, phosphorus 0.007%, nickel 0.87%, molybdenum 0.10, titanium 0.030, boron 0.025, The balance is iron.

[0050] Metal powder cored flux cored wire deposited metal mechanical properties:

[0051]

[0052] Metal powder cored flux cored wire deposited metal...

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Abstract

The invention discloses a metal powder-cored wire for welding X80 high-strength low-alloy pipeline steel. The metal powder-cored wire consists of a carbon steel strip and a metal powder core, wherein a formula of metal powder consists of low-carbon ferromanganese, ferrosilicon, ferrotitanium, nickel powder, ferromolybdenum, ferroboron, magnesium powder, rare earth fluoride and the balance of iron powder. The metal powder-cored wire is characterized by adopting an Ni-Mo-Ti-B alloy system to be applied to the root welding, filling and cover surface welding of the X80 high-strength low-alloy pipeline steel, in particular to the backing welding, so that the melting speed is fast, the melting efficiency is high, the all-position welding can be realized, the content of diffusible hydrogen is lower, and KV2(-45 DEG C) is higher than 100 J.

Description

technical field [0001] The invention belongs to the technical field of gas-shielding flux-cored welding wire, in particular to a metal powder-cored flux-cored welding wire for welding ×80 low-alloy high-strength pipeline steel. Background technique [0002] Gas pipelines at home and abroad tend to develop in the direction of high-strength steel grades and large-diameter pipelines. X80 low-alloy high-strength pipeline steel pipes will be used in the completed Second West-East Gas Pipeline Project, the China-Myanmar Gas Pipeline, and the New Guangdong-Zhejiang Pipeline Project that is currently under construction. In the pipeline welding construction, the welding construction of the first layer of welding pass—the root pass is very important. The welding efficiency directly affects the progress of the entire project, and its welding quality is also the primary guarantee for pipeline safety. Therefore, the selection of root welding method and root welding material determines t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/16
CPCB23K35/3066B23K9/16B23K35/0266B23K35/383
Inventor 侯杰昌马强
Owner TIANJIN YONGCHANG WELDING WIRES
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