Flux-cored wire for gas shield welding of high-strength steel

A technology of welding wire and steel gas, applied in the direction of welding/welding/cutting items, welding medium, welding equipment, etc., to achieve the effect of taking into account the strength

Inactive Publication Date: 2018-04-17
张宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technology of the present invention overcomes the difficult problem that the three in the prior art cannot take into account

Method used

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  • Flux-cored wire for gas shield welding of high-strength steel
  • Flux-cored wire for gas shield welding of high-strength steel
  • Flux-cored wire for gas shield welding of high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0037] The welding test is carried out on the T-joint of 8mm thick HT780 steel plate, in the horizontal position.

[0038] The diameter of the welding wire is 1.2 mm, the chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.

[0039] The welding test results are shown in Table 3.

Embodiment 3-4

[0041] The steel plate is Q890 with a thickness of 16mm, and is welded vertically. The groove is single-sided V-shaped 35°.

[0042] The diameter of the welding wire is 1.2 mm, the chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.

[0043] The welding test results are shown in Table 3.

Embodiment 5-6

[0045] The HT780 steel pipe with an outer diameter of 800mm and a wall thickness of 12mm is selected for circumferential butt welding, and the groove is a single-sided V-shaped 30°.

[0046] The diameter of the welding wire is 1.2 mm, the chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.

[0047] The welding test results are shown in Table 3.

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Abstract

The invention relates to a high-strength steel gas-shielded welding flux-cored wire, which is composed of a steel sheath and a core powder, in terms of total weight percentage, C 0.04-0.10%, Si 0.3-0.8%, Mn 1.1-1.6%, Cu 0.9-2.0%, Ni 1.3-2.5%, Mo 0.6-1.0%, in the core powder, Ti oxide TiO2 conversion value is 0.1-1%, Al oxide Al2O3 conversion value is 0.05-0.5%, fluoride The conversion value is 0.05‑0.3%, and the tensile strength of the weld metal produced by using this welding wire is above 800MPa, and the impact energy at ‑40°C is above 60J.

Description

technical field [0001] The invention relates to a welding wire for gas-shielded welding, which belongs to the field of welding materials, in particular to a flux-cored welding wire for gas-shielded welding of high-strength steel Background technique [0002] With the large-scale and lightweight development of structures in the fields of automobiles, steel pipes, ships and buildings, the demand for high-strength steel is becoming more and more urgent. At present, high-strength steels of 800 MPa and above have been widely used in the fields of automobile, steel pipe and construction industry. [0003] For the welding of high-strength steels of 800MPa and above, in addition to strength, cold cracking and low-temperature toughness of the weld metal are two key technical points. Existing technologies (such as JP-A-2011-20154, 2016-087622) use strong deoxidizing elements to reduce the oxygen content of the weld metal to improve low-temperature toughness, but do not involve how to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30B23K9/16B23K103/04
CPCB23K35/368B23K9/16B23K35/0266B23K35/3066B23K35/3608B23K2103/04
Inventor 张宇
Owner 张宇
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