Flux-cored wire for welding low-temperature steel and preparation method thereof

A technology of flux-cored welding wire and low-temperature steel, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve difficult problems, achieve beautiful appearance, stable performance, low-temperature impact toughness and low-temperature crack resistance and other performance-enhancing effects

Active Publication Date: 2015-03-25
NINGBO LONGXING WELDING CUTTING TECH STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the low-temperature steel flux-cored wire has good low-temperature impact toughness and low-temperature crack resistance, and the average low-temperature impact energy of the deposited metal reaches 78J at -40°C, it still cannot achieve a large-strain steel pipe with higher strength at lower temperatures. For high matching welding of pipeline girth weld and pipe body strength, because the increase in strength will lead to a decrease in toughness, it is difficult to increase the strength of the weld metal under the premise of ensuring that the toughness index meets the technical conditions

Method used

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  • Flux-cored wire for welding low-temperature steel and preparation method thereof
  • Flux-cored wire for welding low-temperature steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, weigh the powder and weight parts of the flux-cored wire flux-core powder used for welding low-temperature steel in Example 1 in Table 1. The particle size of the powder is 60-160 mesh, and mix uniformly to prepare the flux-core powder. Then select the steel strip as the sheath of the flux-cored wire, draw the steel strip into a U-shaped groove structure, and add the above-mentioned prepared flux core powder accounting for 17% of the total weight of the flux-cored wire into the U-shaped groove, and then use a forming machine to After the U-shaped groove is closed, a through hole through the steel strip is formed along the axial direction of the steel strip, and the drug core powder is wrapped in the through hole. Finally, the steel strip wrapped with flux core powder is drawn and reduced in diameter through a wire drawing machine to obtain the final product flux cored wire for welding low temperature steel. The flux-cored wire used for welding low-temperature ste...

Embodiment 2

[0045] Firstly, according to the powder of the flux cored wire flux core powder used for welding low-temperature steel in Example 2 in Table 1 and its weight parts, the powder is weighed, the particle size of the powder is 60-160 mesh, and the flux core powder is prepared by mixing evenly. Then select the steel strip as the sheath of the flux-cored wire, pull the steel strip into a U-shaped groove structure, and add the above-mentioned prepared flux core powder accounting for 18% of the total weight of the flux-cored wire into the U-shaped groove, and then use a forming machine to After the U-shaped groove is closed, a through hole through the steel strip is formed along the axial direction of the steel strip, and the drug core powder is wrapped in the through hole. Finally, the steel strip wrapped with flux core powder is drawn and reduced in diameter through a wire drawing machine to obtain the final product flux cored wire for welding low temperature steel. The flux-cored w...

Embodiment 3

[0047] First, weigh the powder and weight parts of the flux-cored wire flux-core powder used for welding low-temperature steel in Example 3 in Table 1. The particle size of the powder is 60-160 mesh, and mix uniformly to prepare the flux-core powder. Then select the steel strip as the sheath of the flux-cored wire, pull the steel strip into a U-shaped groove structure, and add the above-mentioned prepared flux core powder accounting for 19% of the total weight of the flux-cored wire into the U-shaped groove, and then use a forming machine to After the U-shaped groove is closed, a through hole through the steel strip is formed along the axial direction of the steel strip, and the drug core powder is wrapped in the through hole. Finally, the steel strip wrapped with flux core powder is drawn and reduced in diameter through a wire drawing machine to obtain the final product flux cored wire for welding low temperature steel. The flux-cored wire used for welding low-temperature ste...

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Abstract

The invention relates to a flux-cored wire for welding low-temperature steel. The flux-cored wire comprises a cylindrical skin, wherein a through hole penetrating through the skin along the axis line is formed in the skin, and the through hole is filled with flux core powder composed of mineral powder, metal simple-substance powder (except rare earth elements), alloyed powder, metal oxide powder and rare earth. According to a preparation method of the flux-cored wire, the flux core powder is prepared first and then added into a U-shaped groove which is formed by drawing a steel belt; next, after an opening of the U-shaped groove is closed, the through hole penetrating through the steel belt is formed in the axial direction of the steel belt, and the flux core powder is arranged in the through hole; lastly, the flux-cored wire is obtained by means of step-by-step drawing and diameter reduction. The flux-cored wire can be welded in all directions, the welding efficiency is high, and weld joints are stable in metal performance and more attractive in appearance; besides, the average impact work of deposited metal at the low temperature of minus 60 DEG C can reach 65 J, so that the properties such as low-temperature impact toughness and low-temperature anti-cracking performance are improved to a higher grade.

Description

technical field [0001] The invention relates to a flux-cored welding wire and a preparation method thereof, in particular to a flux-cored welding wire for welding low-temperature steel and a preparation method thereof, belonging to the technical field of metal welding materials. Background technique [0002] As a common common technology, welding is an irreplaceable processing technology in the manufacturing industry, known as "industrial tailoring". Welding technology has been widely used in boilers, pressure vessels, power generation equipment, nuclear facilities, petrochemicals, pipelines, metallurgy, mining, railways, automobiles, shipbuilding, port facilities, aerospace, construction, agricultural machinery, water conservancy facilities, engineering machinery and other industries Among them, it involves a wide range of areas and plays a pivotal role. The level of welding has a decisive effect on product quality. Therefore, welding technology has become one of the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/40B23K35/12
CPCB23K35/368B23K35/40
Inventor 邬剑敏赵善军
Owner NINGBO LONGXING WELDING CUTTING TECH STOCK
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