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High-strength and high-toughness metal powder flux-cored wire

A technology of metal powder core and flux cored wire, applied in metal processing equipment, welding medium, welding equipment, etc., to achieve the effects of excellent seawater corrosion resistance, stable mechanical properties, and good welding process adaptability

Inactive Publication Date: 2013-03-13
WUHAN TEMO WELDING CONSUMABLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no supporting flux-cored welding wire for structural steel with a tensile strength greater than 900MPa (see Table 1)

Method used

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  • High-strength and high-toughness metal powder flux-cored wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The steel sheath of the flux-cored wire is made of low-carbon steel strip, and its chemical composition and content in % by weight of the steel strip are shown in Table 2.

[0062] Table 2 Chemical composition of steel strip

[0063]

Embodiment 2

[0065] The chemical composition and raw material composition of the drug core powder are shown in Table 3.

Embodiment 3

[0067] Fill the core powder in the low carbon steel strip (14X0.9mm), the filling rate is 16~22%, and reduce the diameter by drawing to make a finished welding wire with a diameter of 1.2~1.6mm.

[0068] According to the content ratio of each component of the flux core, different diameters of flux-cored wires were drawn by different filling ratios for testing. The composition ratio, flux core diameter and filling ratio are shown in Table 4.

[0069] Table 3 Composition of drug core powder

[0070]

[0071] Table 4 Composition ratio, drug core diameter, filling rate test

[0072] serial number 1 2 3 4 5 6 7 TiO 2 0.30 0.70 0.10 0.80 1.5 0.90 1.3 SiO 2 0.20 0.35 0.40 0.30 0.10 0.50 0.42 Na 2 O+K 2 o 0.14 0.15 0.02 0.10 0.07 0.2 0.18 NaF + CaF 2 1.0 0.9 0.5 0.6 0.7 0.2 0.4 Si 0.30 0.20 0.50 0.45 0.5 0.40 0.7 Mg+Al 0.44 0.18 0.35 0.24 0.20 0.04 0.40 C 0.14 0.18 0.08 0.02 0.1...

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Abstract

The invention relates to a high-strength and high-toughness metal powder flux-cored wire which comprises a carbon steel sheath (weight percentage: 78-84%) and a flux core (weight percentage: 16-22%), wherein the flux core comprises the following components in percentage by weight: 0.10-1.5% of TiO2, 0.10-0.5% of SiO2, 0.02-0.20% of Na2O+K2O, 0.2-0.7% of Si, 0.04-0.44% of Mg+Al, 0.02-0.18% of C, 0.05-0.30% of Zr, 1.2-2.6% of Mn, 0.6-1.4% of Cr, 3.0-5.0% of Ni, 0.4-2.0% of Mo, 0.2-1.0% of one or two of NaF or CaF2 and the balance of Fe and inevitable impurities. Through adopting a metal powder cored slag system and cooperating with the protection of argon-rich mixed gas (consisting of 80% of Ar and 20% of CO2), the high-strength and high-toughness metal powder flux-cored wire provided by the invention is mainly applicable to downward welding and horizontal fillet welding. In addition, the high-strength and high-toughness metal powder flux-cored wire is good in welding process adaptability, stable in mechanical performance, good in cold cracking resistance, fine in seawater corrosion resistance and excellent in anti-explosion performance; and meanwhile, the yield ratio of weld metals is below 0.87, and the diffusible hydrogen in deposited metals reaches an ultra-low hydrogen level.

Description

technical field [0001] The invention relates to a welding material for metal welding, in particular to a high-strength and high-toughness metal powder-cored flux-cored welding wire. Background technique [0002] Flux-cored welding wire is a high-efficiency welding material developed in the 1950s. It has many advantages such as high welding efficiency, short welding cycle, fast construction progress, good welding process performance, beautiful weld shape, and small welding deformation. Therefore, it is widely used in ships, bridges, etc. It has been standardized in the field of steel structure welding. [0003] With the continuous development of iron and steel smelting technology, in order to reduce construction costs and save steel, various high-strength steels are widely used in ships, marine engineering, bridges and other fields, especially in the cold working conditions in the north, which require that the weld metal should have good low-temperature impact Toughness, ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/24B23K9/16
Inventor 刘玉双韩海峰杜晓琪吕奎清田海成李磊
Owner WUHAN TEMO WELDING CONSUMABLES CO LTD
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