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

A technology of steel gas and welding wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., to achieve the effects of reducing the content of diffusible hydrogen, ensuring low temperature toughness, ensuring strength and low temperature toughness

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

[0006] The technology of the present invention overcomes the problems that the above four performances cannot be balanced: 1) the contradiction between high strength and high toughness; 2) the contradiction between high strength and low crack sensitivity; 3) the contradiction between high toughness and all-position welding performance 4) the contradiction between low crack sensitivity and all-position welding

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0044] The welding test was carried out on a 50mm thick HT980 steel plate, and vertical welding was carried out.

[0045] The diameter of the welding wire is 1.2mm, the chemical composition is shown in Table 1, and the welding parameters are shown in Table 2.

[0046] The welding test results are shown in Table 3.

Embodiment 3-4

[0048] The HT980 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°.

[0049] 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.

[0050] The welding test results are shown in Table 3.

Embodiment 5-6

[0052] The steel plate is HT980 with a thickness of 26mm, and is T-welded.

[0053] 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.

[0054] 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 0.3-0.9%, Mn 0.5-2.0%, Cr 5-10%, Ni 5.0-8.0%; in the core powder, the conversion value of Mg oxide MgO is 0.5-3.5%, the conversion value of Ti oxide TiO2 is 2-7%, and MgO/TiO2=0.2-0.8, fluorine Compound conversion value 0.5‑1.5, and an appropriate amount of arc stabilizer, the rest is iron. The tensile strength of the prepared weld metal is above 980MPa, which is suitable for all-position welding.

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 development of large-scale and lightweight structures in the fields of steel pipes, construction machinery, and construction, the demand for high-strength steel is becoming more and more urgent. At present, 100kg (980MPa) high-strength steel has been widely used in steel pipes, engineering machinery and construction industries. [0003] Compared with manual electrode and solid wire, gas shielded welding with flux cored wire has been widely used because it can improve welding efficiency. For flux-cored gas shielded welding of high-strength steels of 980MPa and above, how to balance cold crack sensitivity and all-position welding process performance while ensuring strength and low-temperature toughness is the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/368
CPCB23K35/3086B23K35/0266B23K35/3073B23K35/3602B23K35/368
Inventor 张宇
Owner 张宇
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