Flux-cored welding wire for steel welding for large heat input welding, its preparation method and welding method

A technology of flux-cored welding wire and welding wire, which is applied in the direction of welding/welding/cutting items, welding equipment, welding equipment, etc., can solve the problems of low mass percentage of flux-cored welding wire, fast consumption of flux-cored welding wire, and decline in welding quality. The effect of good visual quality, increasing conductivity and reducing water content

Active Publication Date: 2021-01-08
北京奥邦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Disclosed in the prior art is a flux-cored welding wire for high-input energy welding and its preparation method and application. The above-mentioned flux-cored welding wire uses TiO 2 , SiO 2 and Al 2 o 3 Materials, in the storage of welding wire, the above-mentioned materials are prone to moisture absorption, and diffuse hydrogen will be generated during the welding operation, resulting in a decline in welding quality. In addition, the mass percentage of the flux core to the flux-cored welding wire is relatively low. The process flux cored wire is consumed too quickly

Method used

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  • Flux-cored welding wire for steel welding for large heat input welding, its preparation method and welding method
  • Flux-cored welding wire for steel welding for large heat input welding, its preparation method and welding method
  • Flux-cored welding wire for steel welding for large heat input welding, its preparation method and welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A steel welding flux-cored wire for large heat input welding, which can be applied to single-wire and multi-wire open-arc welding of medium-thick plates with a heat input of 300-450KJ / cm. The flux-cored wire includes flux-core materials and The carbon steel strip sheath wrapping the drug core material, the drug core material includes: C is 0.06wt%, Si is 0.3wt%, Mn is 1.6wt%, Ni is 2.0wt%, B is 0.01wt% , Ti is 0.01wt%, Nb is 0.1wt%, N is 0.01wt%, and the balance is Fe and unavoidable impurities.

[0052] The carbon steel strip sheath is an SPCC carbon steel strip with a thickness of 0.7 mm and a width of 10.2 mm.

[0053] The drug core material also includes Co, and the content of Co is 0-0.2wt%.

[0054] The drug core material also includes 1.2-2wt% Fe 3 o 4 .

[0055] The drug core material also includes 0.2-0.3 wt% of rare earth elements.

[0056] The drug core material also includes 0.4-0.5wt% NaF.

[0057] The drug core material also includes 1-1.5wt% V.

[...

Embodiment 2

[0098] In this embodiment, the composition of the drug core material is adjusted so that C is 0.08wt%, Si is 0.3wt%, Mn is 1.6wt%, Ni is 2.2wt%, B is 0.01wt%, Ti is 0.01wt%, and Nb is 0.08wt%, N is 0.01wt%, and the balance is Fe and unavoidable impurities.

[0099] With the above flux core material composition and welding method as in Example 1, no heat treatment is performed after welding, the welding input energy is 310KJ / cm, the tensile strength of the weld seam is 760MP, and the impact energy at -40°C is A kv ≥72J.

Embodiment 3

[0101] In this embodiment, the composition of the drug core material is adjusted so that C is 0.10wt%, Si is 0.3wt%, Mn is 1.6wt%, Ni is 2.4wt%, B is 0.01wt%, Ti is 0.01wt%, and Nb is 0.06wt%, N is 0.01wt%, and the balance is Fe and unavoidable impurities.

[0102] With the above flux core material composition and welding method as in Example 1, no heat treatment is performed after welding, the welding input energy is 310KJ / cm, the tensile strength of the weld is 800MP, and the impact energy A at -40°C kv ≥47J.

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Abstract

The invention belongs to the technical field of welding machining materials and particularly relates to a steel welding flux-cored wire used for high heat input welding and a preparing method and a welding method of the steel welding flux-cored wire. The flux-cored wire comprises a flux-cored material and a carbon steel belt sheath wrapping the flux-cored material. The flux-cored material comprises C, Si, Mn, Ni, B, Ti, Nb, N and the balance Fe and inevitable impurities. The preparing method includes the steps of material mixing, wet mixing and heat treatment, drying and smashing and welding wire forming. The welding method includes the step that CO2 and Ar mixed gas is adopted as welding shield gas. Single-substance materials are adopted in the flux-cored wire to serve as the components of the flux-core material, before welding operation, stability of the flux-cored material is better, and the welding effect is more stable.

Description

technical field [0001] The invention belongs to the technical field of welding processing materials, and in particular relates to a steel welding flux-cored welding wire for high heat input welding, a preparation method and a welding method thereof. Background technique [0002] In the construction process of shipbuilding, large-scale steel structure welding, offshore oil platform welding and oil storage tank welding, welding hours account for about 40% of the total working hours, and welding costs account for about 17% of manufacturing costs. The Japanese welding industry has grown from 20 In the early 1990s, the high-energy-input welding technology was applied, and its welding efficiency was nearly 10 times higher than that of the traditional multi-pass welding method. The welding wire produced in Japan can weld the thick plate seam below 70mm at one time, while the welding wire made in China must be welded 10 to 40 times to complete the seam of the thick plate below 70mm....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40B23K9/16
CPCB23K9/16B23K35/0266B23K35/3033B23K35/40B23K35/406B23K2103/04
Inventor 王存
Owner 北京奥邦新材料有限公司
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