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A Flux-Cored Welding Wire Containing Compound Rare Earth Elements Suitable for Welding 1000mpa Ultra-High-Strength Steel

A technology of flux-cored welding wire and compound rare earth, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of crack sensitivity, low toughness and strength of welded joints, etc., to improve plasticity, refine structure and crystallinity grain effect

Active Publication Date: 2021-03-16
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low toughness and insufficient strength of welded joints in the welding process of 1000MPa ultra-high strength steel, and the problem of crack sensitivity in the welding process, and provides a flux-cored welding wire containing composite rare earth elements suitable for welding 1000MPa ultra-high strength steel , can fully meet the high-toughness matching requirements of ultra-high-strength steel, effectively reduce the tendency of crack sensitivity in the welding process of ultra-high-strength steel, make the weld metal have good crack resistance, excellent welding process performance and mechanical properties

Method used

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  • A Flux-Cored Welding Wire Containing Compound Rare Earth Elements Suitable for Welding 1000mpa Ultra-High-Strength Steel
  • A Flux-Cored Welding Wire Containing Compound Rare Earth Elements Suitable for Welding 1000mpa Ultra-High-Strength Steel
  • A Flux-Cored Welding Wire Containing Compound Rare Earth Elements Suitable for Welding 1000mpa Ultra-High-Strength Steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A flux-cored welding wire containing compound rare earth elements suitable for welding 1000MPa ultra-high-strength steel proposed in this embodiment is composed of a flux core and a low-carbon steel strip coated on the outside of the flux core. The flux core includes the following components according to the mass fraction of the welding wire : C: 0.32%, Si: 0.22%, Mn: 1.25%, Cr: 1.2%, Ni: 2.5%, Mo: 0.55%, Ti: 0.33%, Zr: 0.08%, La: 0.05%, Ce: 0.05% , Pr: 0.02%, Er: 0.02%, Y: 0.03%, Sc: 0.015%, and the rest is iron.

[0038] The welding wire is drawn to Φ1.2mm according to the conventional preparation method, and its welding process window is as follows figure 1 shown.

[0039] The filling rate of the flux cored wire is 25.5%.

Embodiment 2

[0041] A flux-cored welding wire containing compound rare earth elements suitable for welding 1000MPa ultra-high-strength steel proposed in this embodiment is composed of a flux core and a low-carbon steel strip coated on the outside of the flux core. The flux core includes the following components according to the mass fraction of the welding wire : C: 0.37%, Si: 0.25%, Mn: 1.44%, Cr: 1.55%, Ni: 3.5%, Mo: 0.68%, Ti: 0.44%, Zr: 0.12%, La: 0.03%, Ce: 0.03% , Pr: 0.01%, Er: 0.01%, Y: 0.04%, Sc: 0.02%, and the rest is iron.

[0042]The welding wire is drawn to Φ2.4mm according to the conventional preparation method.

[0043] The filling rate of the flux cored wire is 25%.

Embodiment 3

[0045] A flux-cored welding wire containing compound rare earth elements suitable for welding 1000MPa ultra-high-strength steel proposed in this embodiment is composed of a flux core and a low-carbon steel strip coated on the outside of the flux core. The flux core includes the following components according to the mass fraction of the welding wire : C: 0.44%, Si: 0.27%, Mn: 1.80%, Cr: 1.2%, Ni: 4.8%, Mo: 0.43%, Ti: 0.6%, Zr: 0.17%, La: 0.04%, Ce: 0.04% , Pr: 0.025%, Er: 0.02%, Y: 0.03%, Sc: 0.015%, and the rest is iron.

[0046] The welding wire is drawn to Φ1.6mm according to the conventional preparation method.

[0047] The filling rate of the flux cored wire is 26%.

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Abstract

The invention discloses a compound-rare-earth-element-containing flux-cored wire suitable for 1000MPa-grade ultrahigh-strength steel welding. The compound-rare-earth-element-containing flux-cored wiresuitable for 1000MPa-grade ultrahigh-strength steel welding is composed of a flux core and a low-carbon steel strip wrapped on the outer side of the flux core. The flux core comprises, by mass percentage, 0.2% -0.9% of C, 0.2% -0.45% of Si, 1.2% -2.0% of Mn, 0.8% -2.5% of Cr, 2.0% - 5.5% of Ni, 0.35% -1.0% of Mo, 0.2% - 0.8% of Ti, 0.05% - 0.25% of Zr, 0.01% -0.09% of La, 0.01% -0.09% of Ce, 0.002% - 0.09% of Pr, 0.01%- 0.09% of Er, 0.01%-0.09% of Y, 0.005%-0.045% of Sc and the balance iron. The flux-cored wire can fully meet the high tenacity matching requirement of ultra-high-strength steeland has excellent welding process properties and mechanical properties.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a flux-cored welding wire containing compound rare earth elements suitable for welding 1000MPa-level ultra-high-strength steel. Background technique [0002] With the continuous large-scale and professional development of the heavy equipment manufacturing industry, high-strength steel can be widely used in manufacturing industries such as shipbuilding, steel structure, automobile manufacturing, mechanical engineering, high-pressure vessels, and pipeline transportation. High-strength steel is increasingly used in welded structures. Widely used, higher requirements are put forward for high-strength steel welded structures: [0003] (1) High-strength steel has high crack sensitivity, which brings great problems to the welding of high-strength steel. When high-strength steel is welded, cracks are prone to occur at the joints, and cracks often occur or expand in the weld m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K35/0266B23K35/3073
Inventor 张天理于航陈毓王伟光方乃文王飞
Owner SHANGHAI UNIV OF ENG SCI
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